PSYC 1000 Lecture Notes - Lecture 12: Energy Homeostasis, Ghrelin, Nucleus Accumbens

• School: University of Guelph
• Department: Psychology
• Course: PSYC 1000
• Professor: Paula Barata

Document Summary

Physiological and psychological process of underlying the initiation of behaviours that direct organisms toward specific goals. A process that influences: direction (activation), persistence, vigour (intensity) Measurement of motivation often inferred through behaviour. Drive-reduction theory motivated (pushed) by need to reduced drives. Homeostasis: a tendency to maintain a balanced internal state or physiological equilibrium. Empty or full stomach: stomach contraption and release of hormones (e. g. ghrelin), full stomach releases different hormones. Levels of glucose (low = hunger) a sugar that serves as an energy source. Hypothalamus different areas regulate appetite suppression (ventromedial & periventricular regions) and appetite stimulation (lateral region), detects changes in stomach through hormone release, detects changes in levels of glucose. High calorie food are rewarding e. g. sugar releases dopamine in the nucleus accumbens. Time of day (time since last meal) Stress and mood stress modulates ghrelin; stress may indicate the need for future resources. Food unit size (e. g. bottomless soup bowl study)