Delusions associated with consistent pattern of brain injury

“Problems caused by these brain injuries include impairment in monitoring of self, awareness of errors, and incorrectly identifying what is familiar and what is a work of fiction,” said Dr. Devinsky, professor of Neurology, Psychiatry and Neurosurgery and Director of the NYU Epilepsy Center at NYU Langone Medical Center. “However, delusions result from the loss of these 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.” 

Often bizarre in content and held with absolute certainty, delusions are pathologic beliefs that remain fixed despite clear evidence that they are incorrect. “Delusions are common problems in a variety of psychiatric and neurological disorders,” said Dr. Devinsky. “Psychiatric disorders with delusions, for example- schizophrenia, have been proven to have functional and structural brain pathology. But now improved diagnostic techniques are allowing us to have increased identification of neurologic disorders among other patient populations with delusions.”

https://www.eurekalert.org/pub_releases/2009-01/nlmc-daw011309.php

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