Infographic depicting the contribution of cannabis use disorder to new cases of schizophrenia in Ontario, Canada.

Swiss psychoanalyst Hermann Rorschach formalized this idea through the inkblot test he created—he noticed that people with schizophrenia tended to perceive the images differently than did other ...

or feel things that aren’t actually there—such as voices or visual images. For people with paranoid schizophrenia, delusions and hallucinations are often grandiose, meaning that they involve ...