If you classically conditioned a person to yawn when he or she heard the word "psychology," the word "psychology," after conditioning, would be considered the stimulus

All of the following are true of bipolar disorder EXCEPT that

a. it is more common than major depressive disorder. b. the duration and frequency of mood disturbance varies from person to person. c. some individuals go right from manic episodes to clinical depression. d. manic episodes may be accompanied by irritability rather than elation.

Research indicates that some ____% of couples suffer from infertility

a) 25 b) 10 c) 75 d) 15