"Until recently, schizophrenia and bipolar disorder were assumed to be diseases of brain neurons. Although there are ten times more glia than neurons, the glia had been relatively neglected. Cotter et al. (London), Ongur et al. (St. Louis), and Uranova et al. (Moscow) all found glial abnormalities in the brain tissue (schizophrenia, bipolar disorder, and depression); this has led to a new research interest in glia."
I pasted this quote from the Stanley Research Website.
"Prior to about 1995, most researchers believed that schizophrenia and bipolar disorder were different diseases. Many of the results from our brain collection have found much overlap of abnormal findings between the two diseases, e.g., 15 out of 23 neurochemical abnormalities overlapped in one study. These findings have contributed to an ongoing re-evaluation of the traditional dichotomy. Bipolar disorder with psychotic features may be closely related to schizophrenia."
This is another interesting quote I pasted from the Stanley website.