webpage about 'What is schizophrenia?'. The answer is that professional bodies, including the Royal College of Psychiatrists (see eg. previous post), can't be relied on for information about psychiatry. There was a time when American psychiatry would have been more cautious about making such a claim. For example, neurobiology was only represented in a few sections of the 1959 American Handbook of Psychiatry (see my book chapter). Any influence of psychoanalysis and Meyerian psychiatry is now difficult to find in modern American psychiatry (see eg. another book chapter).
I'm reminded of the hunger strike on the 16 August 2003 by six "psychiatric survivors" to challenge the APA for evidence to support common claims that major mental illnesses are "proven biological diseases of the brain" and that emotional distress results from "chemical imbalances" in the brain (see Fast for Freedom information webpage). I wrote an article about this situation. It’s still the case that the APA needs to take a more balanced view of the evidence about the neurobiological basis of mental illness.