A single cycle of non-REM and REM sleep lasts about

With respect to the question of therapeutic effectiveness, researchers today are most concerned with asking

a. whether or not psychotherapy works. b. why psychotherapy works and the effectiveness of specific treatments with specific problems and patients. c. what psychotherapy has contributed to the outpatient movement in the United States. d. how much does psychotherapy cost.

Prolonged stress has been shown to ________ cancer

a. decrease vulnerability to b. be unrelated to one's vulnerability to c. increase vulnerability to d. cause e. increase the metastasis of