PSYCH 100 Lecture Notes - Lecture 24: Motivation, Leptin, Twin Study
Document Summary
Psych 100 lecture 24 motives to eat. Motivation: process that causes movement toward a goal or away from an unpleasant situation. Drive: internal state that arises in response to a need. Homeostasis: body"s need to maintain balance (temperature, fluids, etc. ) Intrinsic versus extrinsic motivation: doing something because you enjoy it versus doing something because you get a reward. Set point: genetically influenced weight range that you will stay at when not trying to gain or lose weight: varies about 10% in either direction (set point of 150 pounds could weigh 135- Basal metabolism: rate at which body burns calories; fixed number of fat cells. Heritability of set point is . 4 to . 7 in twin studies. Insulin: hormone that lowers glucose and stores energy as fat. Brain is number one organ in determining hunger. Glucose: sugar that cells require for energy. Ghrelin: hunger-arousing hormone emitted by an empty stomach. Body mass index: measure of weight relative to height.
