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Scientists find why we just can't say no
Wednesday April 25, 2012 08:54:30 AM,
IANS
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Washington: US
Scientists claim to have made a major breakthrough in
understanding the brain's reward centre which could explain why
many people find it literally impossible to resist temptation, be
it food or sex.
Researchers at Dartmouth College, found activity levels in a part
of the brain known as the the nucleus accumbens allowed them to
accurately predict people's eating and sexual behaviour, the Daily
Mail reported.
Women volunteers were shown pictures of food as well as erotic
images and landscapes while their brains were scanned using MRI
imaging to monitor their reactions.
The 48 women, who had no idea what the study was about, returned
six months later and were weighed and asked to fill out a
questionnaire.
Subjects whose whose brains reacted strongly to the food pictures
were found to have gained more weight while those who reacted to
sexual images were more likely to have had sex and report stronger
sexual urges.
Bill Kelley, associate professor of Dartmouth's department of
psychological and brain sciences, says the study demonstrated that
the stronger the response to a stimulus, the less able the subject
is to say 'no'.
Kathryn Demos, who led the study believes the way different women
reacted to the stimulus was a combination of nurture and nature.
She said the idea that all people are equally capable of
self-control is naïve and claims the brain's reward centre 'is a
very powerful system'.
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