Your Brain Decides What You Do When in a Tight Corner

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Posted online: Thursday, November 13, 2008 at 4:48:05 PM

Your Brain Decides What You Do When in a Tight Corner

A recent study has revealed that when we are caught in a tight

corner, the brain is the deciding factor that pulls us through. It

works, like a " bookie's computer " , comparing and contrasting our

actions with those of others and deciding what's the beast way out!

Scientists observing the brain activity of volunteers who worked

through a series of tests say the results challenge conventional

theories about how -- and where -- decisions are formed in the brain.

The findings could also shed light on the mechanisms behind autism, a

condition characterized by the inability to predict how others will

behave, the authors said.

Earlier research on the neural cogs of decision-making has found that

the brain processes two separate streams of data.

One is based on our own experience and our record of success or

failure in similar circumstances. The brain learns from its errors:

if you were wrong, you have to learn something and work out what to

do next time.

The other information stream flows from the fact that we are social

animals, and that we are influenced by what others do and say.

" It is much more complicated to try to figure out how to learn from

other people's behavior, " said Behrens, a researcher at the

University of Oxford and the main architect of the study.

Most scientists had assumed that the neural underpinning of this

second kind of learning was far more complicated than the first,

which essentially is a system of reward and punishment.

Not so, Behrens told AFP in an interview.

The brain is able to learn about this social value -- how trustworthy

someone is, or how much we should copy him -- using the same kind of

basic computational mechanism that we know they use when learning

about rewards, " he said by phone.

The paper, published in the London-based journal Nature, may change

the way scientists study how the brain integrates social inputs into

the choices we make, he added.

" Up to now social processing has been a bit of a dark field because

it has been very difficult to make formal models of how it works, " he

said.

In the experiments, subjects separately tracked the likelihood of a

correct action and of receiving good advice, and then combined the

two into a single probability of a correct response.

The outcome is also consistent with early research showing

neurological anomalies in precisely the same part of the brain --

called the superior temporal sulcus -- affected in persons who are

autistic.

The superior temporal sulcus is the last part of the brain to develop

fully, which could help explain why teenagers may have trouble

figuring out how their words and actions affect others, Behrens said.

The study also shows that another part of the brain involved in how

we make choices -- the anterior cingulate cortex -- has a section

that specializes in dealing with rewards information.

Just a centimeter (half an inch) away is another section that does

the same thing, but processes social information.

Together, they go beyond simply noting that an outcome is different

from what was expected, and " work out how valuable that information

is and how much I should change my behavior, " Behrens said.

Seeing which of the two parts light up in brain imaging tests could

show whether someone takes advice easily, or more likely to ignore

such advice and " go with his own gut feeling, " he added.

Source-AFP

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