To any phd's or m.d's -are psychics and mediums schizophrenic??

i just took a college course, abnormal psychology, and i was reading up on the DSM criteria that must be met for a person to have schizophrenia. then i saw some weird guy on the view the other day "talking to the dead". he reported that heath ledger came to him one day while he was shaving. then later he was doing a reading for people in the audience and he reported seeing several "spirits" and i'm not sure if these spirits had a dialogue with each other. So, i started to wonder what the medical community- psychiatrists, clinical psyhcologists, etc. really make of these people- clairvouyents, etc. a person could be diagnosed with schizophrenia if they meet one of the criteria, as long as it is severe. for example, a chronic auditory hallucination, according to the the DSM. also, theres been more children reporting that they are seeing "dead people" and talking to them...no one finds this disturbing?