William Masters and Virginia Johnson were the first scientists to observe and measure sexual behavior in the laboratory, which resulted in a four-stage model called the ____

Watson, the founder of behaviorism, suggested that psychologists concentrate on studying

a) unseen mental processes. b) overt behavior. c) unconscious forces. d) covert responses.

Theo likes to dump his toys out of the toy box because he loves the noise it makes when it hits the wood floor. He does this several times a day. According to Piaget's first four substages, how old might Theo be?

a. 1 month b. 4 months c. 8 months d. 12 months