PS102 Lecture Notes - Lecture 10: Spinal Cord Injury, Sampling Bias, Bulimia Nervosa
Document Summary
Motivation: all of the processes that initiate, direct, and sustain behaviour. Motives are needs or desires that direct or energize our behaviour. When motives are internal they push us to act drives (thirst) When motives are external called incentives they pull or entice us to act. How does homeostasis work: autonomic nervous system. Primary drive: stems from unlearned motives to satisfy biological needs. Satisfied through: reflexive compensatory mechanisms, coupled with directed behaviour. Internal cue: motivate hunger by stimulating the hypothalamus in the brain, receptors form stomach and intestines and liver. External cues: motive hunger when we see, smell or taste foods that we life. Measures amount of glucose available for metabolic consumption. Hormone produced by fat cells more leptin, less hunger signals from the outside. 20% above the average weight for a given height body mass index bmi individuals weight divided by height, squared. Normal levels of body fat is between 22% and 26%
