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Unformatted text preview: roduce leptin, but brain mutation produce receptors receptors insensitive to leptin 7 Create PDF files without this message by purchasing novaPDF printer ( 11/30/2009 Brain Mechanisms Which is the master control center that regulates hunger? Lateral hypothalamus (LH—hunger-on) Earlier Earlier on on Ventromedial hypothalamus (VMH—hunger-off) Trouble swallowing & digesting Later Later Unresponsive to external stimuli on on Cutting nerve tracts anywhere along path duplicates Cutting some some effects of LH & VMH Paraventricular nucleus (PVN): cluster of neurons (PVN): packed with receptor sites for various transmitters that stimulate or reduce appetite (e.g. Neuropeptide Y) Neuropeptide Psychological Aspects of Hunger Eating Eating is positively reinforced by good taste & negatively by negatively by hunger reduction (based on expectations) (based Attitudes, habits, & psychological needs • • • Beliefs (don’t Beliefs (don’t leave food on plate) Conditioned Conditioned habits (autopilot snacking on TV) (autopilot Dieters (intentionally restrict intake despite hunger) Social pressure, especially for women Women Women aspire to be thinner; Overweight men want to be th...
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