A biological disorder of the brain that runs in families, schizophrenia is the most severe of all the mental illnesses, one characterized by auditory, visual and even tactile hallucinations.
Patrick Tracey has written an interesting article about inherited schizophrenia. In this case, it has been handed down from generation to generation within his family. He even went back to old Ireland to stalk the madness that stalks his family.
This interesting story can be found in the Providence Journal's web site at: http://www.projo.com/opinion/contributors/content/CT_tracey9_01-09-09_HVCQK60_v22.9b9724.html.
My thanks to Francie Ricketson for telling me about this story.