Your brain’s cortex is divided into two hemispheres – right and left. According to Orrin Devinsky, MD, professor of Neurology, Psychiatry and Neurosurgery and Director of the NYU Epilepsy Center at NYU Langone Medical Center, the right hemisphere of the brain dominates self recognition, emotional familiarity and ego boundaries. The job of the left hemisphere is to make sense out of sensual input and information from the right hemisphere – it is the story teller.
There is a complicated interaction between right hemisphere, left hemisphere, your senses, and the animal brain within you. Theories abound as to just how that interaction occurs. Recently, Dr. Devinsky conducted a review of many studies of hemispheric interaction in an attempt to better understand this interaction – focusing on right hemisphere lesions and left hemisphere delusions.
“…delusions result from the loss of these [right hemisphere] functions as well as the over activation of the left hemisphere and its language structures, that ‘create a story’, a story which cannot be edited and modified to account for reality. Delusions result from right hemisphere lesions, but it is the left hemisphere that is deluded.” Lesions in the right hemisphere can cause delusions as the left hemisphere goes to work making sense of distorted identity and emotional information it gets from the injured right hemisphere.
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