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PSY100Y5 (771)
Dax Urbszat (643)
Chapter 10

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University of Toronto Mississauga
Dax Urbszat

CHAPTER 10The Motivation of Hunger and EatingIntroductionoMotives are the needs wants interests and desires that propel people in certain directions oMotivation involves goaldirected behavior oThere are 2 types of motivationbiological motives that originate in biological needs ie hunger and social motives that originate in social experiences ie achievementoPeople share the same biological needs but their social needs and their strengths may varyBiological Factors in the Regulation of Hunger oBrain Regulationexperience of anger is controlled in the brain specifically 2 areas in the hypothalamus Hypothalamustiny structure involved in the regulation of a variety of biological needs related to survival Lateral hypothalamus LHthe ventromedical nucleus of the hypothalamus VMH regulate hunger but not the key elements 3rd area of hypothalamus known as the paraventricular nucleus PVN may play role in hunger regulationContemporary theories of hunger focus more on neural circuits rather than anatomical centers of the brain oGlucose and Digestive RegulationGlucosea simple sugar that is an important source of energyMayerproposed that hunger is regulated by the rise and fall of blood glucose levels Glucostic Theoryproposed that fluctuations in blood glucose level are monitored by glucostatsneurons sensitive to glucose in the surrounding fluid Digestive systemnerves send signals that inhibit further eating by monitoring stretching of stomach walls or carry messages that depend on how rich in nutrients the contents of the stomach are oHormonal Regulationappear to contribute to regulation of hunger Insulinhormone secreted by the pancreas which much be present for cells to extract glucose from the blood Leptinproduced by fat cells throughout the body and released into the bloodstream High levels of fat produce high levels of leptin and circulates through the bloodstream providing the hypothalamus with info about the bodys fat stores
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