Cause is a bit of a odd thing.
But I have around 6-8 schizophrenic friends and have seen some of them develop into clinical significance.
Although trauma seems to be a key trigger, it can seem that any kind of paradoxical state that forces the brain to either chose or compromise can result in psychosis. [for instance one friend started hearing voices, before someone coughed after spending a lot of time thinking about time and the universe etc.... hearing voices because a bit traumatic for him, but the cause was not trauma. ]
There is one predominant characteristic amongst my schizophrenic friends that I have not noticed in other people and upon questioning they are able to identify it in themselves, without attribution to any form of psychosis. The two people I've seen develop to clinical significance also had this trait long before any kind of general oddness was apparent.
This was one of extreme narcissism, that is there where things that they would refuse, or get extremely agitated about if someone helped them do it. Like they have to do things for everyone and their things are their things.
So cause,
extreme narcissism to the point of alterism. (or attaching ones self to things)
and then any contradictory thought process then becomes something very real and personal to that person, and can become clinically significant.
Hallucinations are just illusions is just synaesthetic (say emotions [sense of] being expressed in a visual or auditory sense when the brain cannot cope with expressing them in an emotional way], similar to Autistic spectrum (except autistic spectrum don't attach themselves to things, but can become 'dilluded' to the point of clinical psychosis due to the often paradoxical nature of society and their way of thinking)
I know 20+ people on autistic spectrum, I have Asperger's myself, and have just spent the last 2 years solidly researching and experimenting to identify the core differences between AS, ADHD and schizophrenics and scociopaths/psychopaths and other types. Though as I've been into AI and programming computers since I was 8 (26 years) it's been an ongoing exercise for about that long.
Also Asperger's used to get diagnosed as childhood schizophrenia and probably quite a lot of adults still end up that way.
Classic multiple-personality disorder is the brain coping with a traumatic experience and splitting the personality to cope with the paradoxical nature of the trauma. In someone with AS this can be as little as being touched.
given the similarity I should imagine that schizophrenics have similar sensory experiences, as all I know have great difficulty with emotions or even recognising that they are emotional. None I know have pain and other responses typical in ASD (but sample size small)
anyhow, key determinant is narcissism.
I can post links to articles and such if needed.
also cannabis causes one to focus more [in the way that a camera focuses in on something] [ref ask someone who smokes the stuff], for someone with extreme narcissism this focus would be self orientated no matter what the subject matter, or 'self indulgence', so mostly extremely pleasurable.
