Chapter 12. Motivation and Emotion. Defining Motivation, and a Model . Dynamics of behavior that initiate, sustain, direct, and terminate actions Model of how motivated activities work Need: Internal deficiency; causes drive
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Motivation and Emotion
Fig. 12.1 Needs and incentives interact to determine drive strength (above). (a) Moderate need combined with a high-incentive goal produces a strong drive. (b) Even when a strong need exists, drive strength may be moderate if a goal’s incentive value is low. It is important to remember, however, that incentive value lies “in the eye of the beholder.”
Fig. 12.2 In Cannon’s early study of hunger, a simple apparatus was used to simultaneously record hunger pangs and stomach contractions. (After Cannon, 1934.)
Fig. 12.4 This is a cross section through the middle of the brain (viewed from the front of the brain). Indicated areas of the hypothalamus are associated with hunger and the regulation of body weight.
Fig. 12.6 Women with abnormal eating habits were asked to rate their body shape on a scale similar to the one you see here. As a group, they chose ideal figures much thinner than what they thought their current weights were. (Most women say they want to be thinner than they currently are, but to a lesser degree than women with eating problems.) Notice that the women with eating problems chose an ideal weight that was even thinner than what they thought men prefer. This is not typical of most women. In this study, only women with eating problems wanted to be thinner than what they thought men find attractive (Zellner, Harner, & Adler, 1989).
Fig. 12.7 Monkeys happily open locks that are placed in their cage. Since no reward is given for this activity, it provides evidence for the existence of stimulus needs. (Photo courtesy of Harry F. Harlow.)
Fig. 12.8 (a) The general relationship between arousal and efficiency can be described by an inverted U curve. The optimal level of arousal or motivation is higher for a simple task (b) than for a complex task (c).
Fig. 12.9 Core body temperature is a good indicator of a person’s circadian rhythm. Most people reach a low point 2 to 3 hours before their normal waking time. It’s no wonder that both the Chernobyl and three-Mile Island nuclear power plant accidents occurred around 4 am. Rapid travel to a different time zone, shift work, depression, and illness can throw sleep and waking patterns out of synchronization with the body’s core rhythm. Mismatches of this kind are very disruptive (Hauri & Linde, 1990).
Fig. 12.10 Time required to adjust to air travel across six time zones. The average time to resynchronize was shorter for westbound travel than for eastbound flights. (Data from Beljan et al., 1972; cited by Moore-Ede et al., 1982).
Fig. 12.12 Maslow believed that lower needs in the hierarchy are dominant. Basic needs must be satisfied before growth motives are fully expressed. Desires for self-actualization are reflected in various meta-needs.
Fig. 12.13 Primary and mixed emotions. In Robert Plutchik’s model there are eight primary emotions, as listed in the inner areas. Adjacent emotions may combine to give the emotions listed around the perimeter. Mixtures involving more widely separated emotions are also possible. For example, fear plus anticipation produces anxiety. (Adapted from Plutchik, 2001.)
Fig. 12.15 An amygdala can be found buried within the temporal lobes on each side of the brain. The amygdala appears to provide “quick and dirty” processing of emotional stimuli that allows us to act involuntarily to danger.
Fig. 12.17 A typical polygraph includes devices for measuring heart rate, blood pressure, respiration, and galvanic skin response. Pens mounted on the top of the machine make a record of bodily responses on a moving strip of paper. (right) Changes in the area marked by the arrow indicate emotional arousal. If such responses appear when a person answers a question, he or she may be lying, but other causes of arousal are also possible.
Fig. 12.18 When shown groups of simplified faces (without labels) the angry and scheming faces “jumped out” at people faster than sad, happy, or neutral faces. An ability to rapidly detect threatening expressions probably helped our ancestors survive (adapted from Tipples, Atkinson & Young, 2002).