Dysthymic disorder is to major depressive episode as cyclothymic disorder is to

Which option best describes the main reason for the rise of hunter-gatherer societies?

a. Women's pelvises were wider so they couldn't walk as easily and needed to stay home. b. Human infants had a longer period of dependency on their mothers. c. Humans could make fire, so men needed to hunt for meat to cook. d. Humans could make simple tools so they needed a "home base" to store them.

You and your sister are watching your nephew. Initially he seems to be very interested in a stimulus that recently appeared, but seems not to be very interested in it after a few seconds

Your sister thinks that he might not have a very long attention span. What do you tell her? Your nephew is actually displaying ____. a. boredom b. sensitivity c. dishabituation d. habituation