Scientists have made the first recordings of the human brain’s awareness of its own body, using the illusion of a strategically-placed rubber hand to trick the brain. Their findings shed light on disorders of self-perception such as schizophrenia, stroke and phantom limb syndrome, where sufferers may no longer recognize their own limbs or may experience pain from missing ones.
In the study published today in Science Express online, University College London’s (UCL) Dr Henrik Ehrsson, working with Oxford University psychologists, manipulated volunteers’ perceptions of their own body via three different senses - vision, touch and proprioception (position sense).
They found that one area of the brain, the premotor cortex, integrates information from these different senses to recognize the body. However, because vision tends to dominate, if information from the senses is inconsistent, the brain “believes” the visual information over the proprioceptive. Thus, someone immersed in an illusion would feel, for example, that a fake limb was part of their own body.
Jenny Gimpel | alfa
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