José just played a long, bruising football game but feels little fatigue or discomfort. His lack of pain is most likely caused by the release of.

The purpose of a control group in an experiment is to:

a. serve as a check on the interpretation of results. b. increase the ability to generalize the findings. c. manipulate the dependent variable. d. represent the general, nonlaboratory population.

According to your textbook, which mental disorder received the most attention from early scholars?

a. Phobias b. Depression c. Schizophrenia d. Multiple personality disorder