Aaron Beck theorized that depression is caused by _______.

Theory building is important in psychology because it

a. prevents excessive reliance on empiricism. b. reduces the need for hypothesis testing. c. relies heavily on naturalistic observation. d. provides explanations and guides future research.

Kevin keeps thinking he is an evil, unclean person who is capable of committing murder, even though he would never do such a thing. He tries to put the thoughts out of his mind by washing his hands 15 to 20 times a day. Kevin demonstrates

a. generalized anxiety disorder. c. acute stress disorder. b. obsessive-compulsive disorder. d. panic disorder.