i'm currently reading a book by a well respected psychiatrist/neurologist - who cites 10% of cases of schizophrenia in which he considers the primary aetiology is genetic/brain developmental - not negating physiological aspects within other cases.

He also takes a more integral view - But is also very much coming at things from the orthodox as well.

The book is from 1994 - so may well be dated - i'm not up or well read on current neurological/genetic theory/research, concerning psychosis/schizophrenia - other than the general press release articles. & i take serious issue with primary 'materialist'/biomedical (brain is mind) assumptions.