Psychology 1000 Chapter Notes - Chapter 11: Drive Theory, Expectancy Theory, Homeostasis

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Laura Fazakas- Dehoog

Document Summary

Instinct theory and evolutionary psychology: an instinct is an inherited predisposition to behave in a specific and predictable way when exposed to a particular stimulus. Incentive and expectancy theories: whe(cid:396)eas d(cid:396)i(cid:448)es a(cid:396)e (cid:448)ie(cid:449)ed as i(cid:374)te(cid:396)(cid:374)al fa(cid:272)to(cid:396)s that (cid:862)push(cid:863) o(cid:396)ga(cid:374)is(cid:373)s i(cid:374)to a(cid:272)tio(cid:374), incentives (cid:396)ep(cid:396)ese(cid:374)t e(cid:374)(cid:448)i(cid:396)o(cid:374)(cid:373)e(cid:374)tal sti(cid:373)uli that (cid:862)pull(cid:863) a(cid:374) o(cid:396)ga(cid:374)is(cid:373) to(cid:449)a(cid:396)d a goal. If we overeat or eat too little, homeostatic mechanisms will return us close to our original weight, our set point. Cck is released into your bloodstream by the small intestine as food arrives from the stomach. It does (cid:374)ot (cid:373)ake us feel (cid:862)full(cid:863) like cck a(cid:374)d othe(cid:396) satiet(cid:455) signals that respond directly to food intake during a meal. Instead, leptin may regulate appetite by increasing the potency of these other signals. Pvn and therefore appetite is reduced: but when rats lose fat, less leptin is secreted and therefore neuropeptide y neurons become more active, increasing appetite.