feeding, arising from the small intestine, the liver, or the outside world, are received by receptors in the brain, the stomach, and the intestines; the hypothalamic control centers; food selection; and such problems as obesity, anorexia, and bulimia.
Covering the emotions of fear and rage, he covers how the autonomic nervous system deals with feeling threatened, the disruptive effects of autonomic arousal, and pain and the endorphin system. Under sleep and waking, he covers sleep and brain activity, the stages of sleep, the functions of sleep, including the effects of sleep deprivation, the possible nature of sleep as a restorative process, a clock-driven process, and an evolutionary relic, and dreams, including REM sleep states.
In considering what different motives have in common, Gleitman discusses the psychology of reward and the arousal level. drive-reduction theory, drugs and addiction, and the opponent-process theory of motivation, and biological explanations of reward or pleasur
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