Ralph has lost twenty pounds since he was fired from his job. He either cannot get to sleep or wakes up early and is exhausted the next day. These facts illustrate which symptoms of depression?

What do we call an intensely frightening experience that occurs during Stage 4 sleep?

a) nightmare b) sleep terror c) nocturnal activation d) REM sleep behavior disorder

The fact that you are most likely to marry someone who lives near you illustrates the _______ effect

a. propinquity b. numerosity c. similarity d. reciprocity