According to the textbook, clinicians' understanding of the course and causes of schizophrenia was MOST helped by the discovery of:

One characteristic of schizophrenia that differentiates it from other disorders described in DSM-IV is that the concept of schizophrenia

a. is made up of a number of behaviors or symptoms that aren't necessarily shared by all the people with the disorder b. has been recognized as a serious problem since the early 1800s c. was first identified in the US d. has a single biological cause that has been identified through the use of PET scan technology.

Evolutionary psychology might suggest that certain cognitive strategies and goals are built into the brain because

a. they help humans adapt to their natural environment. b. human brains are similar to the brains of the higher primates. c. they are the result of learning that has taken place over many centuries. d. they are the result of memories we have inherited from our ancestors. e. they are prewired to help us achieve self-actualization during our lifetimes.