PSYC 301 Lecture Notes - Lecture 8: Prefrontal Cortex, Impulsivity, Nucleus Accumbens
16 Dec 2017
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Document Summary
The grape wall experiment video: animal has a very clear understanding of fairness. Value discounting in addicts and the neurobiology of instrumental conditioning. Impulsive choice in other human affairs: contradict to delayed satisfaction. Slower delay discounting & less impulsivity with aging. Slower reward discounting is associated with higher grades. Faster reward discounting is associated with unsafe sex. Mechanism to represent the magnitude and valence (quality) of reward. Neuroeconomics: brain is designed to maximize reinforcement (profit) and minimizing effort (cost) Originates in the ventral tegmental area (vta) Projects to amygdala, striatum, nucleus accumbens and prefrontal cortex. Stimulating vta gets increased dopamine in terminal regions. Important for motivated behavior: get appetitive and avoid aversive. General systems approach: same dopaminergic regions across mammals. Dopamine remembers the cues and values them more than other reinforcement available to you. Instrumental conditioning in the brain coles notes. Amygdala (also important for classical conditioning: indicates reward magnitude and valence, contextual info on potential incoming stimuli.
