Originally published December 29 2005
Research team identifies brain area associated with body image
by Mike Adams, the Health Ranger, NaturalNews Editor
A team of researchers from the University College London Institute of Neurology has discovered that the part of the brain known as the posterior parietal cortex controls whether or not a person perceives himself or herself as overweight.
The area is called the posterior parietal cortex which sits at the side of the head, just above the ear.
The University College London Institute of Neurology team believe the findings might explain why some people feel fat, even when they are thin.
Their findings in PLOS Biology are based on brain scans of volunteers experiencing a body size illusion.
To achieve the so-called "Pinocchio" illusion, the 17 participants each had a vibrating device placed on their wrist to stimulate the tendon and create the sensation that the joint was bending, even though it was not.
With their hand touching their waist, the volunteers felt their wrists bending into their body, creating the illusion that their waists were shrinking.
The volunteers who reported the strongest shrinking sensation also showed the strongest activity in this area of the brain.
Lead researcher Dr Henrick Ehrsson said: "Unlike more elementary bodily senses such as limb movement, touch and pain, there are no specialized receptors in the body that send information to the brain about the size and shape of body parts.
"Instead, the brain appears to create a map of the body by integrating signals from the relevant body parts such as skin, joints and muscles, along with visual cues."
He said other studies have shown that people with injuries in the parietal cortex area of the brain experience the feeling that the size and shape of their body parts have changed.
For example, people who suffer from migraine with aura can sometimes experience a phenomenon called the "Alice in Wonderland syndrome", where they feel that various body parts are shrinking.
"People with anorexia and body dysmorphic disorder who have problems with judging the size of their body might similarly have a distorted representation of their body image in the parietal cortex.
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