According to an article By Traci Pedersen and reviewed by John M. Grohol, Psy.D. on October 1, 2010 in PsychCentral –
Previously, drug treatment of severe psychosis involved focusing on dopamine inhibition. However, new research has linked psychosis to a dysfunction between the brain chemicals dopamine AND glutamate. Hopefully this new connection will shed light on potential treatment options. Schizophrenia is a mental disorder which can cause visual and audio hallucinations. According to the National Institute of Mental Health (NIMH), schizophrenia affects a little over 1% of the population and usually starts in the late twenties/early thirties. Check out the NIMH site! It has great resources for signs/symptoms, medical advancements, links to podcasts, and information about initial care after the first schizophrenic episode.
Movie Spoilers ahead:
Media/Movies have highlighted schizophrenia and psychosis. The Messenger, the movie about Joan of Arc, took the perspective of implying a mental illness. A Beautiful Mind, involves genius/hallucinations/ and schizophrenia. Recently the movie Shutter Island discussed psychosis and the limits of the mind as well as person-centered versus pharmaceutical treatment and philosophy. (Image from the movie A Beautiful Mind. Click the image to go to the imdb site.)