Which of the following is NOT a symptom of ADD?

The capacity of morphine and codeine to provide excellent pain relief occurs because these drugs

a. inhibit the uptake of serotonin. b. cause the loss of physical sensation. c. exert analgesic properties that resemble those of the body's endorphins. d. increase central nervous system activity. e. cause temporary failure within the cerebrum.

The concept of motivation may be defined as

a. voluntary compliance to another's request b. rewarding and punishing behavior so as to change it c. energizing and directing our efforts toward a meaningful goal d. controlling behavior through reinforcements but not punishments