According to Freud, which part of everyone's personality operates according to the "pleasure principle"?

In the study using the visual cliff and 12-month-olds,

A) the majority of the babies refused to cross to the "deep" side. B) none of the babies crossed to the deep side even when their mothers displayed happiness. C) only the babies with easy temperaments crossed to the "deep" side. D) it was not clear whether the babies were responding to their mothers' facial expressions or the loudness of their voices.

Regarding the midlife crisis, which of the following statements is TRUE?

a. Research shows that almost everyone has significant difficulty during the midpoint of life. b. Approximately one-half of men and women believe they have experienced a midlife crisis. c. About a quarter of men and women believe they have experienced a midlife crisis. d. Research shows that no one really experiences a "midlife crisis."