If your narrow minded you'll just look very basically at the issue of high dopamine levels and it's relationship to hullcination.
However if you look a bit more deeper into the topic you'll realize the high dopamine hypothesis is bunk because many people have high dopamine levels but don't become delusional. You could then start pissing in the wind and claim it's high dopamine levels in certain areas of the brain that are causing delusion but that's just as much bunk.
Well although dopamine levels are an indicator the two chemical systems that make a difference is cortisol response and longer term alterations to nmda receptor modulation.
What could cause this type of biological issue.
Trauma, I'll health in life or through genetic inheretence, prelonged psychological disturbance as cortisol response is highly sensitive to the psychology of the mind.
So if you are a Psychiatrist or Pharmacist cut the promotional bull about Schizophrenia and speak from a more learned than assumed view or do you think your special and don't have to do honest science when you claim to be scientific.