PSYCH 202 Lecture Notes - Lecture 34: Grey Matter, Reinforcement, Nicotine
Document Summary
Hunger: energy balance driven by an array of inputs: ghrelin, produced by stomach as a signal to hypothalamus to drive further eating (hunger) Insulin: feedback signal from pancreas to hypothalamus as well as functioning to regulate glucose levels, cck, produced by small intestine to stimulate secretion of other digestive enzymes; also acts on hypothalamus to suppress hunger & induce satiety (satiety) Leptin: produced by body"s fat cells as signal to hypothalamus to inhibit food consumption (satiety) Internal and external survival drives: homeostasis, tendency toward equilibrium, keeping internal parameters of the body in balance, allostasis, stress response; achieving stability through physiological or behavioral change in the face of an external challenge. Interoception: sense of the internal state of the body, knowing when you feel hungry. Defining reward: primary reward, directly address homeostatic or allostatic needs. Secondary reward: abstract rewards; value comes from association with some set of primary rewards, money, consumer goods.
