Antipsychotic drugs reduce psychotic symptoms, at least in part, because they block excessive activity of neurotransmitters at the brain's __________ receptors.

____ is a developmental disorder marked by a lack of interest in social relations, abnormal language development, and repetitive behavior

a. Autism b. Turner syndrome c. Down syndrome d. Fragile X syndrome

Fred sleeps soundly. His alarm makes a loud beeping noise every morning at 7:00AM. Fred's getting out of

bed and turning off the alarm is an example of____________. a. positive reinforcement c. punishment b. negative reinforcement d. aversive conditioning