According to Freud, sexual needs are relatively quiet during which stage of development?

Abraham Lincoln suffered through periods of profound depression throughout his life. What do some historians believe his mood disorder can be traced to?

a. his poverty-stricken upbringing on the Western frontier b. his father losing his property due to faulty property titles c. the death of his mother when he was nine years old d. insomnia

The law of effect was most clearly highlighted by:

a. Pavlov's studies of conditioned salivation. b. Garcia and Koelling's research on taste aversion. c. Skinner's experiments on reinforcement. d. Watson and Rayner's findings on fear conditioning.