The new research on brain found the Brain
Area That Makes Us Optimistic. Humans have a natural tendency to look
at the silver lining, to see beyond facts and rely on hunches to get things
done. A new study has discovered that a certain area in the brain makes us all
optimistic.
Researchers from University College, London and
colleagues have found that magnetic pulses to this region make people less
optimistic and more ready to look at life objectively.
The left and right inferior frontal gyrus (IFG) have been
suspected of being involved in the good and bad news processing; with the left
processing good news and the right processing bad news. The reason why humans
are sometimes hopelessly optimistic is that the right side of the inferior
frontal gyrus doesn't do its job properly leaving the left side to take
control.
To understand the workings of this region, the
researchers selectively inhibited activity in either left or right inferior
frontal gyrus of the brains of 30 volunteers using magnetic pulses. Another set
of participants also received magnetic pulses, but not in this region and so
acted as a control set.
All participants were then asked to rate the probability
of bad things happening in their life. The researchers then read out the actual
likelihood of bad things happening to them according to actual evidence.
Volunteers were then asked to rate the occurrence of bad events in their lives
again after knowing the actual odds.
People who received magnetic pulses to the left side of
the brain were more likely to think logically about occurrence of a bad event.
The researchers say that how the brain filters out the bad news and why it does
so remains a mystery. However, one possible explanation is that by suppressing
negativity, humans can explore new regions and take more risks.
"So much of the work on psychological biases over
the decades has been correlational. Here we have a rare example of a direct
manipulation experiment. This is a great step forward and promises to open up
whole new avenues for research in this area," said Dominic Johnson, a
political scientist from the University of Oxford, reports The Scientist.
Johnson wasn't part of the present study.
The study may help people treat depressed people as
disrupting activity in the right inferior frontal gyrus can lead to people
getting better at being optimistic.
"If you start off in depressed individuals, my
hypothesis would be that disrupting the right IFG would create a bias that
isn't there," said Tali Sharot from University College, London, and one of
the study authors, reports The New Scientist.
The study was published in the journal PNAS.
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