The study, led by Dr Henrik Ehrsson of the UCL Institute of Neurology, used the Pinocchio illusion in combination with functional magnetic resonance imaging to study volunteers' brains. For each volunteer, a vibrating device was placed on their wrist to stimulate the tendon and create the sensation that the joint was flexing, even though it remained stationary. With their hand touching their waist, volunteers felt their wrists bending into their body, creating the illusion that their waists were shrinking.
During the tendon exercise, all 17 participants felt that their waist had shrunk by up to 28 per cent. The researchers found high levels of activity in the posterior parietal cortex, an area of the brain that integrates sensory information from different parts of the body. Volunteers who reported the strongest shrinking sensation also showed the strongest activity in this area of the brain.
Dr Henrik Ehrsson, of the UCL Institute of Neurology, says: "We process information about our body size every day, such as feeling thin or fat when we put our clothes on in the morning, or when walking through a narrow doorway or ducking under a low ceiling. However, 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 t
Contact: Jenny Gimpel
University College London