|MadSci Network: General Biology|
Abnormal behavior can be seen in a variety of neuropsychiatric disorders. Schizophrenia is a brain disorder in which people frequently hear voices (auditory hallucinations) and respond to these resulting in very abnormal behaviors such as talking to themselves. Dissociative Identity disorder (in the past called multiple personality disorder), involves people who usually have had traumatic incidents and split off a part of their personality such that they take on the appearance of more than one personality inhabiting the same body. The causes of most neuropsychiatric disorders are not known but there is good evidence that many are the result of a combination of genetics and the environment. There is no scientific evidence supporting the belief in possession. hope this helps, gabriel vargas md/phd References: Sadock and Sadock 7th Edition Comprehensive Textbook of Psychiatry
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