Currently, in developed nations, most grandparents are surrogate parents

Several areas of the limbic system act as reward, or "pleasure," pathways with many overlapping with the areas that control thirst, sex, and hunger in the

a. cerebellum. b. reticular formation. c. hippocampus. d. hypothalamus.

What does the retinex theory of color vision emphasize?

a. Individual differences among people in how well they distinguish among colors b. Changes in an apparent color based on the colors of surrounding objects c. Cultural differences in how people describe colors d. Changes in people's memory of colors after various time intervals