What Does Schizophrenia Do?

Dr. Gerald Chodek discusses biological factors and their key role in schizophrenia. Neurotransmission is briefly covered, explaining the normal brains activity. Dr. Chodek explains that schizophrenics have unbalanced levels of neurotransmitters, including glutamate and dopamine.

Abnormally high levels of these have been linked to psychotic symptoms, like hallucinations. Dr. Chodek also explains that the hippocampus in some schizophrenics shrinks over time.

What kinds of studies have been done to determine genetic influences of schizophrenia? What have adoption studies shown?