A(n) __________ norm involves perceptions of which behaviors society approves of; a(n) ___________ norm involves perceptions of how people actually behave

REM sleep is called paradoxical sleep because:

a. our heart rate is slow and steady, while our breathing is highly irregular. b. we are deeply asleep but can be awakened easily. c. our nervous system is highly active, while our voluntary muscles hardly move. d. it leads to highly imaginative dreams that are perceived as colorless images.

Flashbulb memories ______

a. are not subject to periodic revision b. usually concern events that are emotionally charged c. are almost always highly accurate d. usually concern events from early childhood