Negative symptoms of schizophrenia include social withdrawal, flat affect, apathy and loss of motivation

Kohler's early studies of insight with chimpanzees led him to conclude that

a. it may involve a combination of classical conditioning and operant conditioning. b. the reinforcement of certain behaviors must occur in order for insight to emerge. c. it was not due to the trial-and-error learning that Thorndike had studied. d. learning a task and later performing it well requires practice. e. it only occurs in a few members of the primate species.

The psychoanalytic model holds that abnormal behavior is the result of ________

a. learning b. biochemical imbalances c. unconscious conflicts d. biology