Rico is a man who has enlarged breasts and suffers from mild mental retardation. He has a problem learning languages, and his body produces less of the male sex hormone testosterone than normal males. Rico is most likely suffering from:

By pairing the ringing of a bell with the presentation of meat, Pavlov trained dogs to salivate to the sound of a bell even when no meat was presented. In this experiment, the presentation of the meat was the _______

a. unconditioned stimulus b. unconditioned response c. conditioned stimulus d. conditioned response

How does physical exercise help maintain cognitive abilities in middle age?

A) Because the brain is a muscle—use it or lose it B) By decreasing low-density lipoproteins ("bad" cholesterol) C) By maintaining cardiovascular fitness D) By increasing optimism and life satisfaction