HMB473H1 Lecture 4: HMB473H1F Lecture 4 Oct 03
Document Summary
Scientific tipping pt: 1950s: some areas in brain when stimulated (cid:224) strong addictive bhvrs in rodents, found by accident, addicted to actions & stimulation, reward regions, vta (cid:224) nucleus accumbens, hpa, not just pleasure adapting, reproducing, adaptive stimuli = unconditioned stimuli, ex. Intimately involved w motivational & motor systems: cyclical nature affected by stress, drives: hunger, seasonal, etc, want , not like , reinforcement = increase in the bhvr that precedes it, reinforcer = buying fries, (cid:224) get fries! It feels good! eg. satiety (but only unexpected rewards) may be a signal of salience instead: dopamine in nacc, drive to obtain reinforcer when lacking (ex. hunger, dopamine in nacc/striatum motivated behaviour/reinforcement mechanisms, negative affect (cid:224) greater drive, amygdala/hypothal(cid:224) motivated behaviours, control of motivated behaviour (pfc, top of the hierarchy, associated cues become rewarding (cues feels good!, prediction of upcoming reward (changes affect cue.
