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مغز همه انسان ها، علیرغم تفاوت های ژرف ژنتیكی، در اساس یكی است

مغز همه انسان ها، علیرغم تفاوت های ژرف ژنتیكی، در اساس یكی است


مغز انسان، علیرغم تفاوت های گسترده رمزهای ژنتیكی آن در میان افراد و قومیت ها، دارای "معماری مولكولی یكسانی" است. این یافته نتیجه دو مطالعه ای است كه بر اساس آنها پایگاه داده هایی تشكیل شده است كه مشخص می كند در طول رشد فرد ژن ها چه هنگام و در كدام ناحیه های مغز فعال و غیر فعال می شوند.

جول كلاینمن، پزشك و دارنده دكترا، و از پژوهشگران شاخه كلینیك اختلال های مغزی سازمان ملی بهداشت ذهن [آمریكا] (NIMH)، پشتیبان این پژوهش ها، توضیح داد: "مطالعه ما نشان می دهد چگونه 650،000 تفاوت ژنتیكی رایج كه از هر كدام از ما شخصی منحصر به فرد می سازد ممكن است در طول رشد و سالمندتر شدن ما بر نشیب و فراز 24،000 ژنی كه در ویژه ترین بخش های مغز مربوط به انسان عمل می كنند تاثیر بگذارند."

هدایت این دو مطالعه را كلاینمن و نناد سستان، پزشك، دارنده دكترا [و عضو] دانشگاه ییل ...،‌ دیگر دریافت كننده كمك مالی NIMH ، بر عهده داشتند. گزارش آنها در شماره 27 اكتبر 2011 مجله علمی نیچر به چاپ رسید.

تامس آر. اینسل، پزشك و مدیر NIMH اظهار داشت: "در دسترس داشتن اطلاعاتی با چنین جزییات درباره این كه چه زمان و چگونه تولیدات ژن خاصی در مغز بروز می یابند به ما این امید را می دهد تا دریابیم این فرایند چگونه می تواند در اسكیزوفرنی، اوتیسم و دیگر اختلال های مغزی از مسیر اصلی خود خارج شود."

هر دو مطالعه پیام رسان های آر.ان.ای. یا رونوشت ها (ترانسكریپتز) را اندازه گیری كردند. این تولیدهای واسطه پیام ها را از دی.ان.ای.، یا نقشه ژنتیكی، حمل می كنند تا پروتیین هایی را تولید نموده و بافت های مغزی را از هم تفكیك نمایند. هر ژنی می تواند چندین رونوشت تولید نماید. این رونوشت ها در الگوهایی بیان می شوند كه تحت تاثیر زیر-مجموعه هایی شامل نزدیك 5/1 (یك و نیم)‌ میلیون شكل از دی.ان.ای.، كه هر كدام از ما را منحصر به فرد می سازد، قرار دارند. این مجموعه منحصر به فرد از رونوشت ها كه "ترانسكریپتم" ما نامیده می شود – امضای مولكولی است كه هر كدام از ما را یگانه می سازد. ترانسكریپتم میزانی از گوناگونی عملكرد بالقوه ای كه در مغز وجود دارد را نشان می دهد. [ادامه در زیر ...]

Our Brains Are Made of the Same Stuff, Despite DNA Differences

EurekAlert! | Public release date: 26-Oct-2011

Gene expression databases reveal 'consistent molecular architecture'

Caption: Our brains are all made of the same stuff. Despite individual and ethnic genetic diversity, our prefrontal cortex shows a consistent molecular architecture. For example, overall differences in the genetic code (“genetic distance”) between African -Americans (AA) and caucasians (cauc) showed no effect on their overall difference in expressed transcripts (“transcriptional distance”). The vertical span of color-coded areas is about the same, indicating that our brains all share the same tissue at a molecular level, despite distinct DNA differences on the horizontal axis. Each dot represents a comparison between two individuals. The AA::AA comparisons (blue) generally show more genetic diversity than cauc::cauc comparisons (yellow), because caucasians are descended from a relatively small subset of ancestors who migrated from Africa, while African Americans are descended from a more diverse gene pool among the much larger population that remained in Africa. AA::cauc comparisons (green) differed most across their genomes as a whole, but this had no effect on their transcriptomes as a whole.

Credit: Joel Kleinman, M.D., Ph.D., NIMH Clinical Brain Disorders Branch

Despite vast differences in the genetic code across individuals and ethnicities, the human brain shows a "consistent molecular architecture," say researchers supported by the National Institutes of Health. The finding is from a pair of studies that have created databases revealing when and where genes turn on and off in multiple brain regions through development.

"Our study shows how 650,000 common genetic variations that make each of us a unique person may influence the ebb and flow of 24,000 genes in the most distinctly human part of our brain as we grow and age," explained Joel Kleinman, M.D., Ph.D., of the National Institute of Mental Health (NIMH) Clinical Brain Disorders Branch.

Kleinman and NIMH grantee Nenad Sestan, M.D., Ph.D. of Yale University, New Haven, Conn., led the sister studies in the Oct. 27, 2011 issue of the journal Nature.

Having at our fingertips detailed information about when and where specific gene products are expressed in the brain brings new hope for understanding how this process can go awry in schizophrenia, autism and other brain disorders," said NIMH Director Thomas R. Insel, M.D.

Both studies measured messenger RNAs or transcripts. These intermediate products carry the message from DNA, the genetic blueprint, to create proteins and differentiated brain tissue. Each gene can make several transcripts, which are expressed in patterns influenced by a subset of the approximately 1.5 million DNA variations unique to each of us. This unique set of transcripts is called our transcriptome – a molecular signature that is unique to every individual. The transcriptome is a measure of the diverse functional potential that exists in the brain.

Caption: Overall gene expression plummets 5-fold in infancy and 90-fold in childhood from its prenatal peak. The decline levels-off during the middle years, but expression surges again in the last decades of life, as the brain ages. Note: The fetal/infant graph at left is based on a different scale than the lifespan graph at right, so the two are not visually comparable.

Credit: Joel Kleinman, M.D., Ph.D., NIMH Clinical Brain Disorders Branch

"Both studies found that rapid gene expression during fetal development abruptly switches to much slower rates after birth that gradually decline and eventually level off in middle age. These rates surge again as the brain ages in the last decades, mirroring rates seen in childhood and adolescence, according to one of the studies. The databases hold secrets to how the brain's ever-changing messenger chemical systems, cells and development processes are related to gene expression patterns through development.

For example, if a particular version of a gene is implicated in a disorder, the new resources might reveal how that variation affects the gene's expression over time and by brain region. By identifying even distant genes that may be turning on and off in-sync, the databases may help researchers discover whole modules of genes involved in the illness. They can also reveal how variation in one gene influences another's expression.

Prefrontal cortex

Kleinman's team focused on how genetic variations are linked to the expression of transcripts in the brain's prefrontal cortex, the area that controls insight, planning and judgment, across the lifespan. They studied 269 postmortem, healthy human brains, ranging in age from two weeks after conception to 80 years old, using 49,000 genetic probes. The database on prefrontal cortex gene expression alone totals more than 1 trillion pieces of information, according to Kleinman.

Among key findings in the prefrontal cortex:

Individual genetic variations are profoundly linked to expression patterns. The most similarity across individuals is detected early in development and again as we approach the end of life.

Different types of related genes are expressed during prenatal development, infancy, and childhood, so that each of these stages shows a relatively distinct transcriptional identity. Three-fourths of genes reverse their direction of expression after birth, with most switching from on to off.

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هر عملی در رویا بخش مرتبط با آن عمل در مغز را فعال می کند

هر عملی در رویا بخش مرتبط با آن عمل در مغز را فعال می کند


هنگامی که انسان ها در رویا می بینند دارند عمل خاصی را انجام می دهند، بخشی از مغز که درگیر برنامه ریزی و اجرای آن عمل است با انجام کنش ها روشن می شود. این یافته، که نتیجه اسکن مغزی روشن رویابینان [کسانی که رویاهای واضح می بینند] در هنگام خواب است، دریچه تازه ای به سوی دانش درباره آگاهی در حالت نه-بیداری به دست می دهد و اولین گام در جهت "رویا خوانی" واقعی است.

به گفته مارتین درسلر، از موسسه روان پزشکی ماکس پلانک: "رویا دیدن [به مانند] فقط تماشای یک فیلم [در حالت] خواب نیست. ناحیه هایی از مغز که بیانگر حرکت های ویژه بدن هستند کنشگر می شوند."

گزارش این مطالعه در شماره آنلاین 27 اکتبر مجله علمی "کارنت بایالوژی،" وابسته به انتشارات سل منتشر شد.

روشن رویابینان کسانی هستند که نسبت به خواب دیدن خود آگاهی دارند و می توانند آگاهانه حرکت های خود در رویاهایشان را کنترل کنند. پژوهشگران دریافتند که این مهارت آموخته شده فرصتی فراهم می نماید تا بتوانند زیرساخت های عصبی رویا دیدن را مورد مطالعه قرار دهند.

مایکل ژیش، یکی از هم نویسندگان این مطالعه، توضیح داد: "اصلی ترین مانع در سر راه مطالعه محتواهای مشخص رویا این است که فعالیت های خودانگیخته رویا را نمی توان به صورت آزمایشگاهی کنترل نمود، زیرا آزمودنی ها عموما نمی توانند فعالیت های ذهنی از پیش تصمیم گیری شده را در هنگام خواب اجرا نمایند. به کارگیری مهارت روشن رویابینی می تواند کمکی باشد تا بر این مانع چیره شویم."

پژوهشگران از شرکت کنندگان خواستند تا هنگامی که وارد مرحله خواب واضح می شوند، در حالی که مغز آنها اسکن می شد، زنجیره ای از حرکت ها با دست چپ یا راست خود، که با زنجیره ای از حرکت چشمان از هم جدا می شد، را انجام دهند. این حرکت های چشم به عنوان علامتی به پژوهشگران عمل می کرد تا بدانند چه اتفاقی در رویا رخ می داد. [ادامه در زیر ...]

Image: via MedicalXpress

Activity in the motor cortex during the movement of the hands while awake (left) and during a dreamed movement (right). Blue areas indicate the activity during a movement of the right hand, which is clearly demonstrated in the left brain hemisphere, while red regions indicate the corresponding left-hand movements in the opposite brain hemisphere. © MPI of Psychiatry

Brain Imaging Study: A Step toward True 'Dream Reading'

Medical Xpress | October 27, 2011

When people dream that they are performing a particular action, a portion of the brain involved in the planning and execution of movement lights up with activity. The finding, made by scanning the brains of lucid dreamers while they slept, offers a glimpse into the non-waking consciousness and is a first step toward true "dream reading," according to a report published online in the Cell Press journal Current Biology on October 27.

"Dreaming is not just looking at a dream movie," said Martin Dresler of the Max Planck Institute of Psychiatry. "Brain regions representing specific body motions are activated."

Lucid dreamers are aware that they are dreaming and can deliberately control their actions in dreams. The researchers realized that this learned skill presents an opportunity for studying the neural underpinnings of our dreams.

"The main obstacle in studying specific dream content is that spontaneous dream activity cannot be experimentally controlled, as subjects typically cannot perform predecided mental actions during sleep," study coauthor Michael Czisch explained. "Employing the skill of lucid dreaming can help to overcome these obstacles."

The researchers instructed participants to make a series of left and right hand movements separated by a series of eye movements upon entering a lucid dream state while their brains were scanned. Those eye movements served as a signal to the researchers of what was happening in the dream.

Those studies show for the first time that neural activity observed in the brain's sensorimotor cortex can be related to dreamed hand movements.

The discovery suggests that lucid dreaming in combination with neuroimaging and polysomnography (a more common form of sleep monitoring) may allow the transfer of more sophisticated "brain reading" tasks to the dreaming state, the researchers say. In other words, it might eventually be possible to predict dreamed content by analyzing patterns of brain activity.

Dresler says it will also be interesting to investigate brain activity at the moment a dreamer becomes lucid.

"The lucid dreamer gains insight into a very complex state: sleeping, dreaming, but being consciously aware of the dream state," he said. "This may inform us about concepts of consciousness."

Provided by Cell Press (news : web)

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کودکان انسان همکاری در حل مشکل را ترجیح می دهند، شمپانزه ها نه

کودکان انسان همکاری در حل مشکل را ترجیح می دهند، شمپانزه ها نه


پژوهش هایی به تازگی نشان داده است که شمپانزه ها بسیاری از پیش درآمدهای شناختی لازم برای پردازش همکاری هایی شبیه انسان را در اختیار دارند. با این حال، هنگامی که درباره همکاری سخن می گوییم، توانمندی های شناختی ممکن است تمام تفاوت میان انسان ها و شمپانزه ها نباشد. پژوهشگران موسسه ماکس پلانک (ام پی آی) برای مردم شناسی تحولی (تکاملی) در لایپزیگ و ام پی آی برای روان-زبانشناسی در نیمگن کشف کرده اند هنگامی که همه ی شرایط برابر باشد، کودکان انسان ترجیح می دهند که برای حل یک مشکل با یکدیگر همکاری نمایند تا آن که به تنهایی با آن مشكل مقابله كنند. از سوی دیگر، بر اساس مطالعه ای بر روی کودکان سه ساله کودکستانی در آلمان و شمپانزه های شبه آزاد، که در آن کودکان و شمپانزه ها می توانستند میان رویکردهای همکاری و یا عدم همکاری در حل مشکل یکی را انتخاب کنند، شمپانزه ها به هیچ روی چنین تمایلی را نشان ندادند.

جامعه های انسانی بر پایه همکاری ساخته شده اند. از دوران خردسالی، کودکان نیاز به کمک را درک می کنند، فعالانه همکاری [دیگران] را به کار می گیرند، توافق می کنند که چگونه اقدام کنند ، و متوجه نقش دوستان در تامین دستیابی به موفقیت هستند. شمپانزه ها هم با هم همكاری می كنند، برای مثال، در گشت زنی در مرزها و شكار جمعی. با اینحال، انسان ها ممكن است در مقایسه با شمپانزه ها انگیزه قوی تری برای همكاری داشته باشند. به گفته دانیل هائون ... "ترجیحی برای انجام دادن امور به صورت جمعی به جای انفرادی انسان ها را از یكی از نزدیكترین اقوام نخستینی آنها جدا می كند. ما انتظار داشتیم كه میان انسان و شمپانزه ها از نظر همكاری تفاوت هایی بیابیم، زیرا انسان ها نسبت به شمپانزه ها در زمینه های گوناگون بیشتری و در شكل ها پیچیده تری با هم همكاری می كنند."

تیم پژوهشگر این مطالعه به كودكان سه ساله آلمانی و شمپانزه هایی كه در یك محیط محافظت شده در جمهوری كنگو زندگی می كنند كارهایی را ارایه دادند كه كه آنها می توانستند خودشان و یا در مشاركت با یك شریك انجام دهند. به طور مشخص، آنها می توانستند برای گرفتن یك جایزه خوراكی دو سر یك طناب را خودشان بكشند یا آن كه یك سر را خودشان می كشیدند و سر دیگر را یك همراه آنها. هاوئن توجه می دهد كه "در چنین محیط شدیدا كنترل شده ای، بچه ها نسبت به همكاری ترجیح نشان دادند؛ [اما] شمپانزه ها نه." [ادامه در زیر ....]

Children, Not Chimps, Prefer Collaboration: Humans Like to Work Together in Solving Tasks -- Chimps Don't

ScienceDaily Oct. 13, 2011

Photo: via ScienceDaily


Cooperation is child´s play: children that are presented with a task that they could perform on their own or with a partner show a preference to cooperate. (Credit: © MPI for Evolutionary Anthropology)


Recent studies have shown that chimpanzees possess many of the cognitive prerequisites necessary for humanlike collaboration. Cognitive abilities, however, might not be all that differs between chimpanzees and humans when it comes to cooperation. Researchers from the MPI for Evolutionary Anthropology in Leipzig and the MPI for Psycholinguistics in Nijmegen have now discovered that when all else is equal, human children prefer to work together in solving a problem, rather than solve it on their own. Chimpanzees, on the other hand, show no such preference according to a study of 3-year-old German kindergarteners and semi-free ranging chimpanzees, in which the children and chimps could choose between a collaborative and a non-collaboration problem-solving approach.

Human societies are built on collaboration. From a young age, children will recognize the need for help, actively recruit collaborators, make agreements on how to proceed, and recognize the roles of their peers to ensure success. Chimpanzees are cooperative too, working together in border patrols and group hunting, for instance. Still, humans might have greater motivation to cooperate than chimpanzees do." A preference for doing things together instead of alone differentiates humans from one of our closely related primate cousins," says Daniel Haun of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany and the Max Planck Institute for Psycholinguistics in Nijmegen, The Netherlands. "We expected to find differences between human and chimpanzee cooperation, because humans cooperate in a larger variety of contexts and in more complex forms than chimpanzees."

The research team presented 3-year-old German children and chimpanzees living in a Congo Republic sanctuary with a task that they could perform on their own or with a partner. Specifically, they could either pull two ends of a rope themselves in order to get a food reward or they could pull one end while a companion pulled the other. The task was carefully controlled to ensure there were no obvious incentives for the children or chimpanzees to choose one strategy over the other. "In such a highly controlled situation, children showed a preference to cooperate; chimpanzees did not," Haun points out.

The children cooperated more than 78 percent of the time compared to about 58 percent for the chimpanzees. These statistics show that the children actively chose to work together, while chimps appeared to choose between their two options randomly. "Our findings suggest that behavioral differences between humans and other species might be rooted in apparently small motivational differences," says Haun.

Future work should compare cooperative motivation across primate species in an effort to reconstruct the evolutionary history of the trait, the researchers say. "Especially interesting would be other cooperative-breeding primates, or our other close relatives, the bonobos, who have both previously been argued to closely match some of the human pro-social motivations," says Yvonne Rekers of the Max Planck Institute for Evolutionary Anthropology and first author of the study.

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مغز برنده: در یک رقابت ورزشی نفس گیر، مغز در نهایت بدن را برنده می کند

مغز برنده: در یک رقابت ورزشی نفس گیر، مغز در نهایت بدن را برنده می کند

رسیدن به خط پایان - تصویر: برگرفته از گوگل ایمیجز

همه ما لحظه هایی را شاهد بوده ایم که در یک مسابقه شانه به شانه و در آخرین ثانیه ها ورزشکاران به خود فشاری به ظاهر ناممکن می آورند تا بتوانند مسابقه را برنده شوند. اکنون یک براورد علمی جدید چنین القا می کند که این قابلیت ورزشکاران نتیجه نیاز مغز آنها به برنده شدن است.

دکتر جو کوربت از دانشگاه پورتسموث [انگلستان]، دریافت که رمز آن فوران انرژی در بدن بی رمق ورزشکاران در لحظه های تعیین کننده در این است که مغز به انبارهای ذخیره انرژی اناروبیک [ناهوازی – زنده و فعال بدون دسترسی به غذا و هوا] بدن دست می برد.

یافته ها نشان داد حتی هنگامی که ورزشکاران به مرحله خستگی مفرط جسمی رسیده بودند، آنها هنوز قادر بودند تا به منابع ذخیره شده انرژی اناروبیک دسترسی بیابند. سامانه انرژی اناروبیک تامین کننده انرژی در هنگام عدم وجود اکسیژن بوده و برای تامین سریع و توانمند انفجارهایی از انرژی به کار می رود.

دکتر کوربت، یک مدرس ارشد فیزیولوژی کاربردی ورزش در دانشکده ورزش و علم تمرین، این مطالعه را با این هدف انجام داد تا دریابد که دقیقا چه چیزی در یک دوچرخه سوار کلید می خورد تا او بتواند در یک سابقه شانه به شانه با کسی سریعتر برود.

در این مطالعه، چاپ شده در "جورنال اف مدیسین اند ساینس این اسپرتز اند اکسرسایز،" (مجله علمی پزشکی و علم ورزش و تمرین) ورزشکارانی که با کسی مسابقه می دادند قادر بودند فورانی از انرژی در خود بیابند تا عملکرد آنها را 7/1 درصد بهبود دهد. در رده های بالای ورزشی این [میزان بهبود عملکرد] می تواند تفاوت میان برد و باخت باشد.

دکتر کوربت گفت: "بیشتر ورزشکاران می دانند که آنها در هنگام رقابت می توانند بهتر عمل کنند، اما تا این هنگام ما نمی دانستیم که دقیقا چرا. ما [اکنون] دریافته ایم که ورزشکاران می توانند برای شکست دادن رقیب به منابع انرژی اناروبیک خود دسترسی بیابند." [ادامه در زیر ...]

[در زیرتر کتابی منتشر شده در سال 2010 توسط یک استاد دانشگاه گلف کانادا معرفی می شود که در آن وی توضیح می دهد ورزشکاران برای برنده شدن باید چگونه مغز خود را آموزش دهند...]

It's All in the Mind - How an Athlete Wins Head-To-Head Competition

University of Portsmouth News | Oct 7, 2011

We’ve all seen the moment an athlete pushes themselves at the last second to try and win a head-to-head race, and now a sports scientist has discovered how they do that.

Dr Jo Corbett from the University of Portsmouth has found the secret to that winning burst lies in the exhausted athlete’s brain tapping into the body’s anaerobic energy stores.

The results showed that even when an athlete had reached physical fatigue they were still able to dip into stored anaerobic energy. The anaerobic energy system provides energy in the absence of oxygen and is used for fast, powerful bursts of energy.

Dr Corbett, a senior lecturer in applied exercise physiology from the Department of Sport and Exercise Science, conducted a study to find out what exactly triggers a cyclist to go faster when they are competing against someone head-to-head.

In his study, published in the Journal Medicine & Science in Sports & Exercise, sportsmen racing against someone else managed to find an extra burst of energy that increased their performance by 1.7 percent. At top level sport this can be the difference between winning or being unplaced.

Dr Corbett said: “Most sportspeople know they perform harder and better when they are competing, but until now we didn’t know precisely why.

“We’ve found out that an athlete is able to dip further into their anaerobic energy reserves in order to beat their opponent.

“Whenever you do exercise you’re likely to think ‘how much am I willing to hurt myself?’ and there’s usually a point which holds you back because you don’t want to do yourself irreparable damage. But when racing someone head-to-head the athlete’s brain can manipulate this signal and keep on going.”

Participants were instructed to complete a 2000 metre cycle in the quickest time possible, in front of a computer screen showing an avatar of themselves doing the ride on a virtual race-course. They had to repeat this exercise on five different occasions.

On the final occasion the cyclists were told to race against another individual behind a partition whose avatar was also being projected onto the same virtual race course in front of them. Despite thinking they were racing someone else – participants were in fact competing against their own previous best time.

Out of 14 cyclists participating 12 of them performed significantly faster in the final race - when they believed they were competing against an opponent. They finished with a burst of speed to ensure their victory and the average speed of most increased from 38.4km/h per hour to 39km/h. Dr Corbett said: “In each race the participants cycled vigorously until they were completely exhausted but it was only in the last race, when they were unknowingly competing against themselves, they were able to race even harder.

“When an athlete finishes exercising they are almost always left with a physiological energy reserve but our results show that head-to-head competition provides the motivation to tell the brain to eat into a greater part of this reserve.”


Prof Tells How to Train Your Brain in New Book

April 13, 2010 – University of Guelph News Release

Never mind age, social status or IQ. Anyone can fine-tune their brain to perform at a higher level, according to a new book by a University of Guelph neuroscientist.

It's not unlike training muscles in the body: for optimal results, you focus on strengthening the parts that enhance performance the most, said Mark Fenske, a professor in Guelph’s Department of Psychology who co-authored The Winner’s Brain: 8 Strategies Great Minds Use to Achieve Success with fellow Harvard-trained brain expert Jeff Brown.

The Guelph launch of the book will be May 12 at 7 p.m. at The Bookshelf in downtown Guelph.

In the brain, boosting function means learning how to flex the parts involved in operations that are critical for success, such as those related to focus, memory, adaptability, emotional control and self-awareness. And the more you learn about the brain and how to best exercise it, the more you can improve its condition.

“In the past, it was believed that the brain was relatively ‘hard-wired,’ that the capacity of the brain to change and develop was severely limited past adolescence,” Fenske said.

“We now know that is not true. Each of our brains retains the characteristic of neuroplasticity — the capacity for changes to its physical structure and function — well into adulthood.”

The Winner’s Brain includes strategies for reshaping the brain and improving function in areas associated with success, such as motivation, optimal risk-taking and resilience. It also explores the brain science behind such factors and includes interviews with famous and not-so-famous people who have developed “winning brains.” Subjects include blues legend B.B. King, actor Laura Linney, Olympic gymnast Kerri Strug, FBI agents and even cab drivers on the streets of London.

“Across the board, what these people have in common is that they have trained their minds to reach their maximum potential,” said Fenske. This involves teaching the brain to do everything from focusing to shut out crowds of thousands to bouncing back from rejection with passion and determination.

His role in the book involved identifying the latest science behind “the winning brain.” A U of G professor since 2007, he uses neuroimaging and studies human behaviour to examine how the brain’s attention and emotion systems can enhance performance. Brains that perform successfully really do “light up” differently in brain scans and perform more efficiently, he said.

In the book, Fenske discusses how the structure and function of the brain is altered as a result of how it’s used. For example, it’s known that cab drivers in London have more developed hippocampuses — the area of the brain involved in memory and spatial navigation — than other people. And musicians who are able to improvise can shut down the portions of the brain correlated with self-consciousness in the process of composing on the fly.

The book’s message is simple: anyone can transform their thinking, feelings and behaviour and even the physical structure of their brain. “We all have a brain, and how it functions depends in part on what you choose to do with it,” he said.

[+] نوشته شده توسط فاطمه بیدی در 9:5 PM | |

مغز ما برای خوشبین بودن سخت افزاری شده است

مغز ما برای خوشبین بودن سخت افزاری شده است


الکساندر پوپ، شاعر انگلیسی، درک درستی داشت هنگامی که در سده 1700 نوشت: "امید می جوشد در سینه انسان – تا به ابدیت."

اکنون مطالعه علمی تازه ای در انگلستان کشف کرد که انسان ها سخت افزاری شده اند تا خوشبین باشند، حتی زمانی که رو در روی واقعیتی تیره و تار قرار دارند.

دانشمندان دانشگاه کالج لندن، با هدایت تلی شرت، گروهی از کسان را مورد مطالعه قرار دادند که به آنها گفته شده بود این احتمال وجود دارد که واقعه ای تلخ را تجربه نمایند. اما، این پژوهش دریافت که بیشتر افراد بسیار خوشبین باقی ماندند.

دانشمندان می گویند: این مطالعه نشان می دهد چرا مردم بیشتر هنگام بی پروا، ساده لوح یا بیش از حد آرزومند/جاه طلب به نظر می رسند.

به گفته دکتر شرت: "ما تمایل داریم تا بیشتر از راه اطلاعات مثبت درباره آینده بدانیم. این به این دلیل است که بخش هایی از پیشانه مغز ما در ردگیری و رمزگذاری اطلاعات مثبت درباره آینده بسیار توانمند است. [اما] هنگامی که شما اطلاعات منفی درباره آینده دریافت می کنید، قطعه های پیشانی مغز شما آن اطلاعات را با کارآمدی رمزگذاری نمی کنند."

دکتر شرت همچنین نویسنده کتابی است با عنوان "پیش انگاری خوشبینانه،" که در آن وی توضیح می دهد چگونه مغز انسان برای امیدوار بودن سیم کشی سخت افزاری شده است.

وی افزود: "اکنون این به این معنا نیست که ما اطلاعات مثبت یا منفی را به یاد نمی آوریم، این تنها به این معنا است که ما برای به روزرسانی باورهایمان اطلاعات مثبت درباره آینده را می گیریم." [ادامه در زیر ...]

Hope Springs Eternal, Scientists Say

Emily Bourke
ABC-AsiaPacific | October 10, 2011

Photo: Study finds human beings are largely optimistic, even in the face of a darker reality. (Matt Cardy: Getty Images)

English poet Alexander Pope got it right in the 1700s when he wrote "Hope springs eternal in the human breast".

A new British study has found human beings are hard-wired to be optimistic, even in the face of a darker reality.

Scientists led by Tali Sharot at the University College London studied a group of people who were told they were likely to experience something bad.

The results found most people stayed highly optimistic.

And the researchers say the study shows why people are often foolhardy, naive or overly ambitious.

"We tend to learn more from positive information about the future," Dr Sharot said.

"The reason is that regions of the front of your brain are very good at tracking and coding for positive information about the future.

"When you get negative information about the future, the frontal lobes don't code that information as efficiently."

Dr Sharot is also the author of a book called The Optimism Bias, which explains how the human brain is hard-wired for hope.

Audio: Human brain accentuates the positive (AM)

"Now it doesn't mean that we don't remember positive or negative information, it just means that we take positive [information] about the future in order to update our beliefs," she said.

"For example, if we learn that the probability of suffering from a certain disease is actually less than what we expected, we take that information and we update that belief of how likely we are to suffer a medical disease.

"But if we get negative information about the future, for example, everyone knows that divorce rates are about 50 per cent, we don't take that information as relevant to us and don't change or estimate on how likely we are to get divorced."

Hope springs eternal in the human breast;
Man never Is, but always To be blest:
The soul, uneasy and confin'd from home,
Rests and expatiates in a life to come.

Alexander Pope, An Essay on Man

Even in the face of mounting negative information about the likelihood of illness, accident or even heartbreak, people still cling to the positive.

"It's some sort of denial. We think that we will be okay. This is not going to happen to us. You can say it's some sort of denial," Dr Sharot said.

But she warned downplaying the negative comes at a cost.

"We might not take the precautionary actions needed," she said.

"For example, you might not go to medical screening as often as you should because you think you are going to be okay.

"You might not buy insurance, and when we talk about financial markets, what happens is the optimism bias of all of the individuals come together into a bubble and actually a bias that is much, much bigger, and in that situation it can be ever more dangerous."

Dr Sharot says the research also provides insights into mental illness.

"If we know how the healthy brain works, we get insight into what happens in mental illness such as depression.

"The second thing we learn is that optimism doesn't change your beliefs. It will actually make you more likely to take actions to protect yourself."

Looking on the bright side, the findings show being optimistic makes us more adventurous and productive, lowers stress and anxiety, and promotes health and wellbeing.

The research is published in the journal Nature Neuroscience.

First posted October 10, 2011 10:59:29


Brain Imaging Reveals Why We Remain Optimistic in the Face of Reality

EurekAlert! | Public release date: 9-Oct-2011

For some people, the glass is always half full. Even when a football fan's team has lost ten matches in a row, he might still be convinced his team can reverse its run of bad luck. So why, in the face of clear evidence to suggest to the contrary, do some people remain so optimistic about the future?

In a study published today in Nature Neuroscience, researchers at the Wellcome Trust Centre for Neuroimaging at UCL (University College London) show that people who are very optimistic about the outcome of events tend to learn only from information that reinforces their rose-tinted view of the world. This is related to 'faulty' function of their frontal lobes.

People's predictions of the future are often unrealistically optimistic. A problem that has puzzled scientists for decades is why human optimism is so pervasive, when reality continuously confronts us with information that challenges these biased beliefs.

"Seeing the glass as half full rather than half empty can be a positive thing – it can lower stress and anxiety and be good for our health and well-being," explains Dr Tali Sharot. "But it can also mean that we are less likely to take precautionary action, such as practising safe sex or saving for retirement. So why don't we learn from cautionary information?"

In this new study, Dr Sharot and Professor Ray Dolan from the Wellcome Trust Centre for Neuroimaging, together with Christoph Korn from the Berlin School of Mind and Brain have shown that our failure to alter optimistic predictions when presented with conflicting information is due to errors in how we process the information in our brains.

Nineteen volunteers were presented with a series of negative life events, such as car theft or Parkinson's disease, whilst lying in a functional magnetic resonance imaging (fMRI) scanner, which measures activity in the brain. They were asked to estimate the probability that this event would happen to them in the future. After a short pause, the volunteers were told the average probability of this event to occur. In total, the participants saw eighty such events.

After the scanning sessions, the participants were asked once again to estimate the probability of each event occurring to them. They were also asked to fill in a questionnaire measuring their level of optimism.

The researchers found that people did, in fact, update their estimates based on the information given, but only if the information was better than expected. For example if they had predicted that their likelihood of suffering from cancer was 40%, but the average likelihood was 30%, they might adjust their estimate to 32%. If the information was worse than expected – for example, if they had estimated 10% – then they tended to adjust their estimate much less, as if ignoring the data.

The results of the brain scans suggested why this might be the case. All participants showed increased activity in the frontal lobes of the brain when the information given was better than expected, this activity actively processed the information to recalculate an estimate. However, when the information was worse than estimated, the more optimistic a participant was (according to the personality questionnaire), the less efficiently activity in these frontal regions coded for it, suggesting they were disregarding the evidence presented to them.

Dr Sharot adds: "Our study suggests that we pick and choose the information that we listen to. The more optimistic we are, the less likely we are to be influenced by negative information about the future. This can have benefits for our mental health, but there are obvious downsides. Many experts believe the financial crisis in 2008 was precipitated by analysts overestimating the performance of their assets even in the face of clear evidence to the contrary."

'Understanding the brain' is one of the Wellcome Trust's key strategic challenges. At the Wellcome Trust Centre for Neuroimaging, clinicians and scientists study higher cognitive function to understand how thought and perception arise from brain activity, and how such processes break down in neurological and psychiatric disease.

Commenting on the study, Dr John Williams, Head of Neuroscience and Mental Health at the Wellcome Trust, said: "Being optimistic must clearly have some benefits, but is it always helpful and why do some people have a less rosy outlook on life? Understanding how some people always manage to remain optimistic could provide useful insights into happens when our brains do not function properly."

###

The research was funded by the Wellcome Trust, the British Academy and the German Academic Exchange Service.

Contact: Craig Brierley
c.brierley@wellcome.ac.uk
44-207-611-7329
Wellcome Trust

[+] نوشته شده توسط فاطمه بیدی در 9:4 PM | |

خرد جمعی برتر از مجموع هوش افراد یک گروه عمل می کند

هنگامی که در مورد هوش صحبت می کنیم، به واقع خرد کل می تواند برتر از جمع خرد اعضا باشد.  در مطالعه جدیدی که به وسیله پژوهشگران ام.آی.تی.، دانشگاه کارنگی ملون، و یونیون کالج انجام گرفت آنها مستنداتی را گردآوری کردند که وجود خرد جمعی را در میان گروه هایی از افراد که به خوبی با هم همکاری می کنند نشان داد، و نیز نتیجه گرفت که چنین عقلی فراتر از قابلیت های شناختی تک تک اعضای گروه بوده، و این که همکاری موثر در یک گروه با تعداد زنان حاضر در آن رابطه مستقیم دارد.

بسیاری از دانشمندان علوم اجتماعی برای مدت ها ادعا می کرده اند که قابلیت افراد برای آن که وظایف شناختی گوناگون را به خوبی انجام دهند نشانگر وجود درجه ای از هوش قابل اندازه گیری در هر فرد است.  در مطالعه ای که در شماره زودهنگام و آنلاین مجله علمی "ساینس" انتشار یافت، پژوهشگران اصل مشابهی را به تیم های کوچکی از افراد بسط دادند.  آنها دریافتند گروه هایی که دارای پویایی درونی مناسبی هستند در انجام طیف وسیعی از وظایف به خوبی عمل می کنند – یافته ای که می تواند دارای کاربردهای بالقوه ای در بخش های بازرگانی و سازمان ها باشد.

آنیتا ویلیامز وولی، نویسنده اصلی مقاله و استادیار دانشکده بازرگانی تپپر در کارنگی ملون  می گوید: "ما بر مبنای آزمودن این نظریه شروع کردیم که گروه ها، همانند افراد، قابلیت پایداری در انجام مجموعه ای از وظایف دارند." تامس دبلیو. میلون، یک نویسنده دیگر مقاله و استاد مدیریت کرسی مک گاورن در دانشکده مدیریت سلون در ام.آی.تی. ادامه می دهد: "نظریه ما تایید شد.  ما دریافتیم که یک تاثیرگذاری همگانی، یک خرد دستجمعی گروهی وجود  دارد که عملکرد گروه  را در بسیاری موردها پیش بینی می کند."

پژوهشگران بر این باور  هستند که هوش جمعی از آنجا برمی آید که افراد گروه تا چه اندازه با یکدیگر همکاری می کنند.  برای نمونه، گروه هایی که افراد آن را کسانی با "حساسیت اجتماعی" افزون تر تشکیل می دادند دارای خرد جمعی بالاتری بودند.   کریستوفر کبریس، یک هم-نویسنده مقاله و استادیار  روان شناسی در یونیون کالج نیویورک می گوید: "حساسیت اجتماعی به این ارتباط دارد که اعضا تا چه اندازه به خوبی احساسات یکدیگر را درک می کنند."  وولی می افزاید: "همچنین در گروه هایی که یک فرد نقش چیره داشت، این گروه ها از هوش جمعی کمتری، در مقایسه با گروه هایی که در آنها جریان بحث چرخش متعادل تری داشت، برخوردار بودند."  به علاوه، تیم هایی که شمار زنان در آنها بالاتر بود حساسیت اجتماعی بیشتری نشان دادند و در مقابل خرد جمعی آنها در مقایسه با گروه هایی که تعداد زنان کمتری داشت بالاتر بود.  ...



 

When Facing Difficult Tasks, New Study Finds Groups Demonstrate Distinctive 'Collective Intelligence'

Editor's Choice
Main Category: Psychology / Psychiatry
MNT - Article Date: 02 Oct 2010

When it comes to intelligence, the whole can indeed be greater than the sum of its parts. A new study co-authored by MIT, Carnegie Mellon University, and Union College researchers documents the existence of collective intelligence among groups of people who cooperate well, showing that such intelligence extends beyond the cognitive abilities of the groups' individual members, and that the tendency to cooperate effectively is linked to the number of women in a group.

Many social scientists have long contended that the ability of individuals to fare well on diverse cognitive tasks demonstrates the existence of a measurable level of intelligence in each person. In a study published in the advance online issue of the journal Science, the researchers applied a similar principle to small teams of people. They discovered that groups featuring the right kind of internal dynamics perform well on a wide range of assignments, a finding with potential applications for businesses and other organizations.

"We set out to test the hypothesis that groups, like individuals, have a consistent ability to perform across different kinds of tasks," says Anita Williams Woolley, the paper's lead author and an assistant professor at Carnegie Mellon's Tepper School of Business. "Our hypothesis was confirmed," continues Thomas W. Malone, a co-author and Patrick J. McGovern Professor of Management at the MIT Sloan School of Management. "We found that there is a general effectiveness, a group collective intelligence, which predicts a group's performance in many situations."

That collective intelligence, the researchers believe, stems from how well the group works together. For instance, groups whose members had higher levels of "social sensitivity" were more collectively intelligent. "Social sensitivity has to do with how well group members perceive each other's emotions," says Christopher Chabris, a co-author and assistant professor of psychology at Union College in New York. "Also, in groups where one person dominated, the group was less collectively intelligent than in groups where the conversational turns were more evenly distributed," adds Woolley. And teams containing more women demonstrated greater social sensitivity and in turn greater collective intelligence compared to teams containing fewer women.

To arrive at their conclusions, the researchers conducted studies at MIT's Center for Collective Intelligence and Carnegie Mellon, in which 699 people were placed in groups of two to five. The groups worked together on tasks that ranged from visual puzzles to negotiations, brainstorming, games and complex rule-based design assignments. The researchers concluded that a group's collective intelligence accounted for about 40 percent of the variation in performance on this wide range of tasks.

Moreover, the researchers found that the performance of groups was not primarily due to the individual abilities of the group's members. For instance, the average and maximum intelligence of individual group members did not significantly predict the performance of their groups overall.

Only when analyzing the data did the co-authors suspect that the number of women in a group had significant predictive power. "We didn't design this study to focus on the gender effect," Malone says. "That was a surprise to us." However, further analysis revealed that the effect seemed to be explained by the higher social sensitivity exhibited by females, on average. "So having group members with higher social sensitivity is better regardless of whether they are male or female," Woolley explains.

Malone believes the study applies to many kinds of organizations. "Imagine if you could give a one-hour test to a top management team or a product development team that would allow you to predict how flexibly that group of people would respond to a wide range of problems that might arise," he says. "That would be a pretty interesting application. We also think it's possible to improve the intelligence of a group by changing the members of a group, teaching them better ways of interacting or giving them better electronic collaboration tools."

Woolley and Malone say they and their co-authors "definitely intend to continue research on this topic," including studies on the ways groups interact online, and they are "considering further studies on the gender question." Still, they believe their research has already identified a general principle indicating how the whole adds up to something more than the sum of its parts. As Woolley explains, "It really calls into question our whole notion of what intelligence is. What individuals can do all by themselves is becoming less important; what matters more is what they can do with others and by using technology."

"Having a bunch of smart people in a group doesn't necessarily make the group smart," concludes Malone.

Notes:
In addition to Woolley, Malone and Chabris, the other co-authors were Alexander Pentland, the Toshiba Professor of Media Arts & Science at the MIT Media Lab; and Nada Hashmi, a doctoral candidate at MIT Sloan.
"Evidence for a collective intelligence factor in the performance of human groups" by Anita Williams Woolley, Christopher F. Chabris, Alexander Pentland, Nada Hashmi, and Thomas W. Malone. Science, 30 September, 2010. 

Source: Massachusetts Institute of Technology
Copyright: Medical News Today

 

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فرایند تصمیم گیری در مغز – سلول های عصبی رای می دهند

 


همه ما می دانیم که فرایند انداختن رای در صندوق انتخابات، سیاست ها، ارزش ها، و شخصیت ها را شامل می شود.  اما، پیش از آن که شما آن دگمه را برای نامزد مورد نظرتان فشار دهید [رای را به صندوق بیاندازید]، مغز شما از پیش یک رای گیری [درونی] انجام داده است تا به آن تصمیم برسد.  پژوهش جدیدی از دانشگاه وندربیلت فاش می کند که مغز ما در رویارویی با یک تصمیم گیری ابتدا به جمع آوری مستندات می پردازد و هنگامی که آن مدارک موازنه را به نفع یک جهت تغییر دادند شروع به عمل می نماید.

این پژوهش در شماره اکتبر "سایکالاژیکال ریویو" [مرور روان شناسانه] انتشار یافت.  

بریدن پرسل، یک دانشجوی دوره دکترا در دانشکده روان شناسی و یکی از نویسندگان اصلی این مطالعه اظهار داشت: "نمونه های روان شناسانه [فرایند] تصمیم گیری نشان می دهد که انسان ها برای رسیدن به یک تصمیم مشخص به تدریج و در طول زمان اقدام به جمع آوری مدارک می کنند، و هنگامی که شواهد به یک مرحله کلیدی می رسد تصمیم خود را عملی می کنند."  وی افزود: "ما دریافتیم که به نظر می رسد سلول های عصبی ویژه ای نماینده جمع آوری مدارک تا آستانه ای هستند و دیگران نماینده خود آن مدارک هستند، و کنش و واکنش این دو گونه از سلول های عصبی است که تصمیم گیری را راهبری می کند."

پژوهشگران به میمون ها وظیفه ساده یافتن هدفی بر روی یک صفحه نمایشگر را که محتوی اقلامی برای منحرف کردن حواس آنها نیز بود محول کردند.  پژوهشگران دریافتند نرون هایی که اطلاعات دیداری را پردازش می کنند اطلاعات صفحه نمایشگر را به سلول های عصبی عهده دار حرکت خوراندند.  این سلول های حرکتی به  مانند دروازه بانان عمل کرده، و تا هنگامی که اطلاعات دریافتی از نرون های دیداری به اندازه کافی روشن نبود مانع عمل می شدند.  ، آنگاه که  آن [وضوح] اتفاق می افتاد سلول های عصبی حرکتی کار خود را شروع کرده و حرکت انتخاب شده را  عمل می کردند.

پژوهشگران همچنین متوجه شدند که نرون های حرکتی در رقابت میان آنچه که دیده می شد – در این حالت، میان هدف و اقلام انحراف حواس – میانجی شده و اطمینان می یافتند که در هنگام نگاه کردن به آیتم درست تصمیم گرفته می شد.  

به گفته چفری شال، یک هم نویسنده این مطالعه و صاحب کرسی برونسون اینگرام در عصب شناسی: "به نظر می آید آنچه که مغز انجام می دهد این است که برای هر رایی که برای یک کاندیدا دریافت می کند یک رای برای کاندیدای مخالف را بی اثر می سازد، و به این ترتیب تفاوت های میان دو را بزرگنمایی می کند.  سامانه (سیستمی) که تصمیم نهایی را می گیرد به نتایج آرا تا هنگامی که روشن نیست نتیجه انتخابات به سمت کدام کاندیدای مشخص پیش خواهد رفت گوش نمی دهد.  در آن نقطه، مداری که حرکت را ایجاد می کند استارت می زند و حرکت رخ می دهد."  ...

 

Neurons Cast Votes to Guide Decision-Making

ScienceDaily (Oct. 8, 2010) — We know that casting a ballot in the voting booth involves politics, values and personalities. But before you ever push the button for your candidate, your brain has already carried out an election of its own to make that action possible. New research from Vanderbilt University reveals that our brain accumulates evidence when faced with a choice and triggers an action once that evidence reaches a tipping point.

The research was published in the October issue of Psychological Review.

"Psychological models of decision-making explain that humans gradually accumulate evidence for a particular choice over time, and execute that choice when evidence reaches a critical level. However, until recently there was little understanding of how this might actually be implemented in the brain," Braden Purcell, a doctoral student in the Department of Psychology and lead author of the new study, said. "We found that certain neurons seem to represent the accumulation of evidence to a threshold and others represent the evidence itself, and that these two types of neurons interact to drive decision-making."

The researchers presented monkeys with a simple visual task of finding a target on a screen that also included distracting items. The researchers found that neurons processing visual information from the screen fed that information to the neurons responsible for movement. These movement neurons served as gatekeepers, suppressing action until the information they received from the visual neurons was sufficiently clear. When that occurred, the movement neurons then proceeded to trigger the chosen movement.

The researchers also found that the movement neurons mediated a competition between what was being seen -- in this case, the target and distracting items -- and ensured that the decision was made to look to the proper item.

"What the brain seems to do is for every vote it receives for one candidate, it suppresses a vote for the other candidate, exaggerating the differences between the two," Jeffrey Schall, E. Bronson Ingram Chair in Neuroscience and co-author of the study said. "The system that makes the response doesn't listen to the vote tally until it's clear that the election is going towards one particular candidate. At that point, the circuitry that makes the movement is triggered and the movement takes place."

The findings offer potential insights into some psychological disorders.

"Impairments in decision-making are at the core of a variety of psychological and neurological impairments. For example, previous work suggests that ADHD patients may suffer deficits in controlling evidence accumulation," Purcell said. "This work may help us to understand why these deficits occur at a neurobiological level."

An important piece of this research is the novel model the researchers used in the study. The new model combined a mathematical prediction of what they thought would transpire with actual data about what the neurons were doing.

"In a model, usually all the elements are defined by mathematical equations or computational expressions," Thomas Palmeri, associate professor of psychology and a co-author of the study, said. "In our work, rather than coming up with a mathematical expression for the inputs to the neural decision process, we defined those inputs with actual recordings from neurons. This hybrid model predicts both where and when the eyes move, and variability in the timing of those movements."

"This approach provides insight between psychological processes and what neurons are doing," Schall said. "If we want to understand the mind-brain problem, this is what solutions look like."

The research was supported by the Temporal Dynamics of Learning Center, the National Science Foundation, the Air Force Office of Scientific Research, the James S. McDonnell Foundation and the National Institutes of Health as well as Robin and Richard Patton through the E. Bronson Ingram Chair in Neuroscience.

Palmeri is director of graduate studies for the graduate program in Psychological Sciences and co-director of the Perceptual Expertise Network. Schall is director of the Center for Integrative Cognition and Cognitive Neuroscience, director of the Vanderbilt Vision Research Center, and a Vanderbilt Kennedy Center for Research on Human Development investigator. Additional co-authors on the study were Richard P. Heitz, Jeremiah Y. Cohen and Gordon D. Logan.

[SD] Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.

Story Source: The above story is reprinted (with editorial adaptations by ScienceDaily staff) from materials provided by Vanderbilt University.

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سر و صدا ممکن است به کودکان کم توجه در کلاس کمک کند

ایجاد سر و صدای "اغتشاش خالص" (وایت نویز) در کلاس می تواند به کودکان بی اعتنا در  یادگیری کمک کند.  پژوهشگران  در مجله علمی آزاد دسترس "بیهیویرال اند برین فانکشنز" (عملکردهای رفتاری و مغز)، وابسته به مرکز بایومد، نوشتند که آنها تاثیر صداهای بی معنای تصادفی را بر یک گروه 51 نفری از کودکان دانش آموز آزمایش کردند و دریافتند که اگرچه این صداها برای کودکانی که به طور عادی توجه دارند مانع ایجاد کرد، اما حافظه کودکانی که در تمرکز دچار مشکل بودند را بهبود داد.

گوران سودرلوند از دانشگاه استکهلم، سوید، با همراهی گروهی از پژوهشگران این آزمایش ها را در یک مدرسه راهنمایی در نروژ انجام داد.  به گفته وی: "با افزایش میزان صداها، در  عملکرد کودکانی که توسط آموزگاران خود به عنوان کم توجه شناسایی شده بودند بهبود چشمگیری مشاهده شد، و در عملکرد آنهایی که متمرکز شناسایی شده بودند کاهش چشمگیری دیده شد.  این یافته می تواند کاربرد عملی داشته و روش غیر تهاجمی، و غیر دارویی برای کمک به کارنامه کودکانی باشد که دارای چالش های تمرکزی هستند."

در این آزمایش، از کودکان خواسته شد تا هر اندازه که می توانند موردهایی را از یک سیاهه که با صدای بلند در هنگام پخش و یا عدم پخش اغتشاش خالص برای آنها خوانده می شد به خاطر بسپارند.  پژوهشگران گمانه زنی کردند که پدیده "تشدید تصادفی" (استوکاستیک رزوننس) ممکن است عملکرد کودکان بی توجه در این آزمایش را توضیح دهد.  به گفته سودرلوند، "هنگامی که اغتشاش خالص به موج (سیگنال) ضعیفی که در پایین آستانه شنوایی قرار دارد اضافه می شود آن (سیگنال) را قابل ردیابی می کند.  مطالعه ما برای اولین بار صدا و تشدید تصادفی را هم به عملکردهای شناخت برتر و هم به توجه ربط می دهد."

Study Links Noise and Stochastic Resonance to Higher Cognitive Functions and Attention

The Medical News | 29 September 2010

Playing white noise in class can help inattentive children learn. Researchers writing in BioMed Central's open access journal Behavioral and Brain Functions tested the effect of the meaningless random noise on a group of 51 schoolchildren, finding that although it hindered the ability of those who normally pay attention, it improved the memory of those that had difficulties in paying attention.

Göran Söderlund from Stockholm University, Sweden, worked with a team of researchers to carry out the experiments at a secondary school in Norway. He said, "There was significant improvement in performance for the children rated as inattentive by their teachers, and a significant decline in performance for those rated as attentive as noise levels were increased. This finding could have practical applications offering non-invasive and non-pharmacological help to improve school results in children with attentional problems".

The children were challenged to remember as many items as possible from a list read out either in the presence or absence of white noise. The researchers speculate that a phenomenon called 'stochastic resonance' may explain the improved performance of inattentive pupils seen in the test. According to Söderlund, "When a weak signal is presented below the hearing threshold it becomes detectable when random or white noise is added to the signal. Our study is the first to link noise and stochastic resonance to both higher cognitive functions and attention".

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فروید و روح روانکاوی

در این مقاله به نقش فروید در بنیانگذاری روانکاوی بعنوان یک روش علمی در یافتن اسرار درونی آدمی تاکید شده است. مطالعه این مقاله را به دانشجویان توصیه می نمایم.

دکتر ابراهیمی

Sigmund Freud
and the Spirit of Psychoanalysis

By Jean Chiriac, President of AROPA

Everybody knows today that Sigmund Freud, the famous Viennese neurologist, is the founder of psychoanalysis. But because of the influences of the nowadays psychoanalytical  expression and culture, few still know what Freud thought about the psychoanalysis he had created, what opinion he had regarding the task of psychoanalysis.

To Freud psychoanalysis was a scientific method  for the investigation of our mental life and a psychotherapeutic method.

Being scientific, it borrows from the exigencies of science two fundamental aspects:

- the requirement of observing the studied facts. Unlike religion, which derives its truths from revelations, psychoanalysis extracts them from direct observation;

- the description and  the integration into a theory, the formulation of the rules that contribute to the occurrence and manifestation of the observed facts.

We must remember that psychoanalysis hadn't been revealed to Freud, as a mystical act, but it was based on his (and others') clinical observations, in a step-by-step process.

To Freud  psychoanalysis never stopped to be a therapeutical method. Although it often gave birth to some speculations concerning the cultural, religious facts, etc., in Freud's view psychoanalysis should be restricted to the  theory of neuroses. And to its task to cure mental disorders.

To this we must add the following detail: in Freud's view, the necessity to understand the mysteries of he human behavior was considered the  first and foremost in the psychoanalytical act. More than once Freud stated that is more important to understand than to treat. Of course this vision is shocking for us but it emphasized what is essential  regarding the spirit of psychoanalysis: the fact of interrogating the psychical observed phenomena in order to understand the enigma of the human behavior and, therefore, to cure of, where it is meet and proper. The emphasis on understanding, on knowledge represents the unmistakable  mark of the spirit of psychoanalysis...

Translation by Ochea Corina

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نقش خانواده در فرآیند بزهکاری

دکتر ابراهیمی

آنچه در مقاله زیر مطالعه می کنید بررسی روانشناختی جالبی از فضای روابط کودک در خانواده که منجر به رفتارهای ناسازگارانه  می گردد را ارائه نموده که قابل توجه می باشد.

New Research on Alienated Children
by Daniel H. Swerdlow-Freed, Ph.D.

(Daniel H. Swerdlow-Freed, Ph.D.is a Licensed Psychologist.
Contact information is available at the end of this article.)

Several years ago, our newsletter featured an article on parental alienation, in which we summarized Richard Gardner's proposition that parental alienation syndrome, or PAS, was a diagnosable disorder with distinct features. Over the past several years, his opinions have received much criticism and led mental health professionals to formulate research-based explanations of the dynamics that cause children to reject contact with a parent. On the basis of their research, Drs. Joan Kelly and Janet Johnston recently published a new theory of the alienated child, which we believe advances understanding of this complicated issue. Since this topic is of interest to so many of our readers, we are providing a summary of their paper. **

Kelly and Johnston define an alienated child as "…one who expresses, freely and persistently, unreasonable negative feelings and beliefs (such as anger, hatred, rejection, and/or fear) toward a parent that are significantly disproportionate to the child's actual experience with that parent." Their definition requires that the child's behavior toward and relationship with the alienated parent should be the primary focus, rather than the behavior of the alienating parent, as Gardner suggested. Furthermore, they note the importance of differentiating the alienated child from other children who resist contact with a parent for realistic or developmentally appropriate reasons.

This new formulation conceptualizes a child's relationship to each parent as falling along a continuum from positive to negative. At its most healthy end, a child enjoys a positive relationship with both parents and wants to spend approximately equal time with each of them. The next position is for children who have an affinity with one parent. These children feel closer to, and prefer to spend more time with one parent but desire substantial contact with the other parent.

Some children express a consistent preference for either their mother or father during the marriage, and have formed an alliance with that parent. Following separation or divorce, these children may desire limited contact with the non-preferred parent, although they do not completely rejecting this individual. Alliances often develop because of unhealthy dynamics that existed during the marriage, intense post-divorce conflict or children's moral assessment of their parent's behavior. Such alliances have the potential to become unhealthy, particularly if parental conflict continues at a high level. Two factors that distinguish allied from alienated children are that the former are willing to acknowledge positive feelings for the non-preferred parent, and they can articulate credible reasons for seeking reduced contact with that individual.

Children who have witnessed or been subjected to violence, abuse or neglect, are at increased risk to become estranged from the parent who perpetrated these acts, although their feelings about that parent may only be expressed after separation has occurred and a sense of safety has developed. A child may also become estranged from a parent who is extremely immature and self-centered, consistently unreliable or inadequate, or chronically angry, rigid or critical. While estranged children may present as if they are alienated, they differ from alienated children because their fear and anger have a basis in reality and their attitudes and behavior are in proportion to these experiences.

At the unhealthy end of the continuum is the alienated child, who completely rejects a parent without showing any guilt or ambivalence, and refuses all contact with that individual. Severe distortions and exaggerations often characterize the child's reports about the relationship with the rejected parent. Close scrutiny reveals that these youngsters are often responding to dynamics that occurred during the divorce process, to ill-advised parental behavior and to their own psychological vulnerabilities.

Using a systems framework, Kelly and Johnston identified a series of factors and child responses that are critical to accurate diagnosis and effective intervention. They determined that while risk factors vary from one case to another, they often contain the following components: a child who has become triangulated in the parental conflict, a spouse who experienced the decision to divorce as a profound humiliation, an ongoing pattern of intense conflict and litigation, and to the involvement of new partners, extended family or other professionals who purposely or unwittingly contribute to conflict.

If a child perceives that s/he has been abandoned by a parent, that child is vulnerable to become alienated. Feelings of abandonment may occur when a parent leaves the marital home, when a child is seriously confused about the reasons for the separation or divorce, or when a parent begins a new love relationship and devotes less attention to the child. In some cases, separation followed by long periods with no contact between the nonresidential parent and the child can exacerbate the child's sense of abandonment.

Children who were psychologically vulnerable prior to separation often lack the resiliency to cope with the pressures that accompany divorce. Some children find it easier to deal with anxiety and uncertainty by siding with one parent against the other, and thereby securing the preferred parent's loyalty. Children who do have good reality testing may become confused by events they witness or overhear, and are vulnerable to misinterpret or misunderstand their meaning, especially if they cannot discuss these situations with a caring adult who can help them make an independent evaluation of their experience.

Through our work with divorced children and parents, we know that no single factor produces an alienated child, and that these convoluted, difficult situations threaten the psychological well being of each family member. We believe, along with Kelly and Johnston, that a comprehensive assessment is needed to clarify the multiple factors that have led a child to reject a parent with whom s/he previously enjoyed a meaningful relationship. Only with the benefit of such an evaluation, can each pertinent factor be identified and accounted for, and an effective intervention strategy planned and implemented.

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روانکاوی چیست؟

 دکتر ابراهیمی

روانکاوی شیوه ای در جهت بررسی فرآیندهای روانی است که بوسیله سایر روشها امکانپذیر نمی باشد. این شیوه برای درمان اختلالات نوروتیک بکار می رود. در مقاله زیر شما به زبان ساده کاربرد روانکاوی و تکنیکها و ابزار مورد استفاده روانکاوان را به همراه تاریخچه کوتاهی از آن را مطالعه خواهید نمود.

 

 

What is Psychoanalysis

iconPsychoanalysis is a method for the investigation of mental processes, inaccessible by other means. At the same time psychoanalysis is also a therapeutic method for neurotic disorders.

Freud on Tabor street
Freud on Tabor Str
by Joachim Torr

As therapeutic technique, psychoanalysis is different from psychiatry and psychotherapy in general, as it stipulates the existence of a psychic unconscious, and insists on analysis and the integration of the unconscious as therapeutic procedure.

The psychoanalysis gradually built on clinical observation and research, accompanied by reflections and theoretical ideas concerning the structure of the psychic apparatus, the dynamic of mental processes, repression, resistance, transference, etc.

iconThe definition of psychoanalysis includes knowledge acquired from psychic unconscious research and analysis. Such knowledge has gradually made up a new body of science called psychoanalysis.

Psychoanalysis is also applied to the study of social, cultural, and religious phenomena. In this latter aspect, demanding for a re-evaluation of the mechanisms and meanings of culture, psychoanalysis has penetrated the consciousness of the wider public beyond its therapeutic limits.

Psychoanalysis was Born in Vienna

Psychoanalysis was born in Vienna by the end of the 19th century and spread with the contribution of Freudian disciples and dissidents, who, more or less loyal to Freudian theories, have issued currents and schools of psychoanalysis with various shades of difference. That is the case of analytic psychology forged by C. G. Jung, as well as that of individual psychology, made up by Alfred Adler.

Psychoanalysis together with elements of psychoanalytical doctrine and practice are also to be found in modern psychotherapeutic currents, under various shapes and blends.

Sigmund Freud on Psychoanalysis

"Psycho-analysis is the name (1) of a procedure for the investigation of mental processes which are almost inaccessible in any other way, (2) of a method (based upon that investigation) for the treatment of neurotic disorders and (3) of a collection of psychological information obtained along those lines, which is gradually being accumulated into a new scientific discipline." (From "Two Enciclopaedia Articles", 1923)

"Psycho-analysis may be said to have been born with the twentieth century; for the publication in which it emerged before the world as something new - my Interpretation of Dreams - bears the date '1900'. But, as may well be supposed, it did not drop from the skies ready-made. It had its starting-point in older ideas, which it developed further; it sprang from earlier suggestions, which it elaborated." (From "A Short Account of Psycho-Analysis", 1924)

"Freud […] made an alteration in their technique, by replacing hypnosis by the method of free association. He invented the term 'psycho-analysis'..." (From "Psycho-Analysis", 1926). AROPA

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ازدواج و رضایت زناشویی

عنوان مقاله ای که مطالعه خواهید کرد این است :‌ازدواج هنگامی برای سلامت زنان مفید است که میزان رضایت زناشویی در آنها بالا باشد.

 دکتر ابراهیمی

بر اساس این پژوهش جالب زنانی که  از ازدواجشان رضایت زیادی دارند سلامت روانی و رفتاری بدنی بالایی دارند و کمتر دچار بیماریهای خطرناک نظیر اختلالات عروقی  و قلبی می گردند. مطالعه این مقاله را به همه دانشجویان و علاقمندان توصیه می نمایم.

 

 

MARRIAGE APPEARS TO BE BENEFICIAL TO WOMEN’S HEALTH, BUT ONLY WHEN MARITAL SATISFACTION IS HIGH, NEW RESEARCH SHOWS


WASHINGTON — Women who are in satisfying marriages have a health advantage over unmarried women or those in unsatisfying marriages, according to a study published in the September issue of Health Psychology, a journal of the American Psychological Association (APA). The study, involving middle-aged women over a 13-year period, finds that women in good marriages were less likely to develop risk factors that lead to cardiovascular diseases compared with other middle-aged women.

Researchers from San Diego State University and the University of Pittsburgh compared cardiovascular risk profiles and trajectories of women who were married or living with a romantic partner and who had high relationship satisfaction with those of women with moderate or low relationship satisfaction and with those women who were single, divorced and widowed. Participants were 493 women (ages 42-50) from the University of Pittsburgh’s Healthy Women Study, a longitudinal study that looked at health risk factors during and after menopause. Risk factors were measured during an average of more than five visits over 13-years. Each visit included a blood draw to measure cholesterol and glucose levels, blood pressure evaluation, body-size measurements and assessment of health behaviors (such as diet, smoking and exercise) and psychosocial characteristics (such as depression, anxiety, anger and stress).

Participants who were married or cohabitating completed a seven item marital quality questionnaire that assessed satisfaction with amount of time spent together, communication, sexual activity, agreement on financial matters and similarity of interests, lifestyle and temperament. The questionnaire was completed at the beginning of the study and during the three-year follow-up assessments.

Results indicate that women in marriages characterized by high levels of satisfaction showed a health advantage when compared with participants in marriages characterized by low levels of satisfaction and with unmarried participants (single, widowed or divorced). This included lower levels of biological and lifestyle cardiovascular risk factors – such as blood pressure, cholesterol levels and body mass index – and lower levels of psychosocial cardiovascular risk factors – such as depression, anxiety and anger. Those women in highly satisfying marriages also showed this same health advantage when compared with women in moderately satisfying marriages, but to a lesser extent.

How might being in a good marriage influence health? Previous research indicates several direct and indirect factors may be a work, according to the authors. Marriage itself may offer a health advantage by providing social support and protecting against the risks associated with social isolation. Also, spousal influence and involvement may encourage health-promoting behaviors and deter unhealthy behaviors. Married people, especially women, may also be at a health advantage relative to their unmarried counterparts through the increased availability of socioeconomic resources.

However, research shows poor marital quality may erase these health advantages, say the authors. Marital stress is associated with lifestyle risk factors and nonadherence to medical regimens. Poor marital quality is also linked with more depression, hostility and anger, all risk factors for coronary heart disease. Thus, marital status and quality could influence metabolic risk factors and acute stress responses, which in turn predict cardio-vascular morbidity and mortality, according to the study.

“For the most part, the higher risk groups seemed to maintain an elevated level or risk across the entire study, suggesting that by middle age, the cumulative influence of being single, divorced or widowed or of being in a distressed relationship had already occurred,” according to the researchers. Future research with younger couples may identify how and when women in distressed marriages and unmarried women develop higher risk cardiovascular profiles, they add

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استرس و هیجان می تواند سلامت قلب را مورد هدف قرار دهد.

استرس و هیجان می تواند سلامت قلب را مورد هدف قرار دهد.

STRESS AND EMOTIONS CAN NEGATIVELY AFFECT HEART HEALTH

بر اساس مطالب زیر هر گونه فشار روانی می تواند مستقیما به آسیب های جدی قلبی منجر گردد. در مقاله زیر به زبان بسیار ساده چند راهکار برای تشخیص و اقدام در جهت ممانعت از چنین آسیبهایی ارائه شده است.مطالعه آن برای دانشجویان مفید می باشد.

 دکتر ابراهیمی

APA Provides Tips for Mind/Body Health

WASHINGTON — Prevention is a key message during National Heart Health month, and the American Psychological Association (APA) today released strategies to help Americans manage stress.

Research shows that 20 percent of Americans are worried that stress will affect their health, yet 36 percent say they deal with stress by eating or drinking alcohol. While these behaviors may reduce stress in the short term, they contribute to an unhealthy lifestyle that can negatively affect your body and are proven risk factors for cardiovascular disease.

“Achieving a healthy lifestyle comes from adopting behaviors over time that help to manage stress in effective ways that don’t at the same time take a toll on your physical health and body,” says Russ Newman, Ph.D., J.D., APA executive director for professional practice.

Although heart disease is a serious condition that requires constant monitoring, there are many lifestyle and behavioral changes you can do to manage stress and reduce your risk for cardiovascular problems.

• Identify the sources of stress in your life and look for ways to reduce and manage them. Seeing a professional like a psychologist to learn to manage stress is helpful not only for preventing heart disease, but also for speeding recovery from heart attacks when used along with structured exercise programs and other intensive lifestyle changes.
• Talk to your doctor. No two people are alike, and some treatment or risk reduction strategies may be inappropriate or even harmful if you attempt to do too much too quickly.
• Avoid trying to fix every problem at once, if possible. Focus instead on changing one existing habit (e.g., eating habits, inactive lifestyle). Set a reasonable initial goal and work toward meeting it.
• Don't ignore the symptoms of depression. Feelings of sadness or emptiness, loss of interest in ordinary or pleasurable activities, reduced energy, and eating and sleep disorders are just a few of depression’s many warning signs. If they persist for more than two weeks, discuss these issues with your heart doctor. It may be that a psychologist working in collaboration with your physician would be beneficial.
• Enlist the support of friends, family, and work associates. Talk with them about your condition and what they can do to help. Social support is particularly critical for overcoming feelings of depression and isolation during recovery from a heart attack.
• If you feel overwhelmed by the challenge of managing the behaviors associated with heart disease, consult a qualified psychologist. He or she can help develop personal strategies for setting and achieving reasonable health improvement goals, as well as building on these successes to accomplish other more ambitious objectives. A psychologist can also help clarify the diagnosis of depression and work with the physician to devise a suitable treatment program.

For more information about mind/body health, heart disease and stress management, please contact Peter Wilson at (202) 336-5910 or visit APA’s Help Center at www.apahelpcenter.org. To download APA’s pre-packaged news segment on heart health or to capture mind/body health sound bites, please visit http://apahelpcenter.mediaroom.com

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