Studies of the immune system suggest that increased stress produces increased negative moods, which results in:

Adolescents' use of antagonistic interactions such as sarcasm and ridicule are related to

a. the increased capacity for complex thinking. b. disputes between friends. c. developmental trajectory of inter-crowd competition. d. decreases in family interaction.

Stimulant drugs have which of the following effects on hyperactive children?

a) increased activity level b) immediate and steady improvement in academic achievement c) short-term improvements in attention, goal-directed activity and behavior d) addiction to the medication