Reward and Learning PNS1

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Created by: ksjvsba
Created on: 17-01-16 14:53

Rescorla Wagner (72)

Estimates the expected reward using an exponentially weighted average of recently received rewards/

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Neuromodulator dopamin and its most prominent target.......... are implicated in motivation and action

the straitum

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What is the basal gangia input?

Projection from entire cortex (inc sensory, motor, associative areas) to striatum... TOPOGRAPHIC

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What are the basal gangia functions?

Motor control (plus range of motor disorders, but also drug abuse, reward, motivation). Particular Ideas; action selection or facilitation and suppression, behavioural switching/monitoring/regulation, sequential movements,limbic, reinforcemen learnin

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Dopamine is involved in...

reward, self stimulation, addiction, motor control, synaptic plasticity

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Dopamine in response to reward as weighted sum of current and past rewards

Looks like current t-weighted average of past rs(t-V)

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Dopamine response to reward as function of prediction error r-V

Quite linear, negative error cut off due to low baseline response

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What should prediction error do?

Drive learning about expected rewards and guide decision making

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the straitum

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Reward and Learning PNS1