Made me think on a few things. The article mentions experiments to induce out of body experiences, even in non-schizophrenic people. This sounds like something that could prove useful in magical experiments and rituals.
Second, when entering the hallucinatory stage the schizophrenic encounters ‘angels’, but believing in this reality leads them deeper into psychosis. Magi I know also have relationships with angels without becoming psychotic. Maybe they are hallucinatory, but maybe they still serve some form of subjective or magical use?