107cs5 - I. Motivation: a. Interplay with reward system:...

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I. Motivation: a. Interplay with reward system: relative value of outcome should be sufficient to cause action b. System measuring cost, benefit of action and general status (behavioral economics/neural economics) c. Motivational states plays into whether system’s basic needs have been met i. Moldy bread ii. Hungry rat iii. eating habits reflect state d. Distinctions i. Reward vs reinforcement ii. Wanting vs liking (craving for the system vs “that feels good”) e. Reward is coded at many levels of the system i. Quantitatively (in different structures) ii. Qualitatively (in different structures) f. Uncertainty: useful in predicting behavior and outcome of next state i. If uncertainty about food, scanning behavior results ii. Low degrees of certainty boost attention, because you need to learn more, so you need to engage in more perceptual experience iii. Learning/attention is a result of uncertainty 1. Motivational factors: a. contact stimuli (immediately available) vs remote stimuli (further away) b. time constraints (eg is the food going to go bad/be taken away?) 2. Two different behavior types: a. consummatory (eating) b. appetitive (exploration, looking for new food, instrumental) 3. Network of structures involved: a. mPFC/ant cingulate i. Huge dopamine input here b. VTA -> frontal cortex (Orbitofrontal) i. VTA (also has GLU neurons – LTP?) c. SN -> caudate/putamen (striatum) d. NAcc: DA binds here e. Thalamus i. Subdivisions also involved: VP/MD/SNr/MLR/STN f. Brainstem effectors attach to Dopamine nuclei i. located above the pons ii. also proposed Raphe Nuc (5-ht), Loc Cer (NE), Nucl bas (ACh) g. Need DA to respond to reward (motivation) h. Damage to amygdala: affective/visceral system has no response (eg no elevation of heart rate or blood pressure), report good/bad things i. Damage to OFC: behavior is inappropriate
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4. Experimental data:
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This note was uploaded on 04/23/2008 for the course COGS 107C taught by Professor Chiba during the Spring '07 term at UCSD.

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107cs5 - I. Motivation: a. Interplay with reward system:...

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