I googled it and here's what I found: There's more info on the website... I just copied the intro.
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http://www.schizophrenia.com/hypo.php
Introduction
Experts now agree that schizophrenia develops as a result of interplay between biological predisposition (for example, inheriting certain genes) and the kind of environment a person is exposed to. These lines of research are converging: brain development disruption is now known to be the result of genetic predisposition and environmental stressors early in development (during pregnancy or early childhood), leading to subtle alterations in the brain that make a person susceptible to developing schizophrenia. Environmental factors later in life (during early childhood and adolescence) can either damage the brain further and thereby increase the risk of schizophrenia, or lessen the expression of genetic or neurodevelopmental defects and decrease the risk of schizophrenia. In fact experts now say that schizophrenia (and all other mental illness) is caused by a combination of biological, psychological and social factors, and this understanding of mental illness is called the bio-psycho-social model.
It goes into greater detail, but it does say that social factors are part of the picture. That would include the only social interaction a jw is allowed.
Coffee