3_12_09_RewardAndAddiction

3_12_09_RewardAndAddiction - Unsupervised learning is...

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Unsupervised learning is self-organization to maximize extraction of information from input.
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One way is by having a supervisor tell the network whether its performance is good.
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Classical conditioning is an implicit-memory dependent on stimuli correlations.
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Pavlov showed that classical conditioning can occur with both rewards and punishments.
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Prefrontal Cortex Nucleus Accumbens Ventral Tegmental Area Reward mechanisms involve the prefrontal cortex, the nucleus accumbens, and the VTA.
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The role of the dopaminergic VTA neurons appears to be getting reward-prediction error.
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In delayed-reward experiments, VTA neurons first respond only to reward; later, they respond to stimuli, showing suppression without reward.
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The VTA-nucleus-accumbens circuitry also mediate the mechanisms of addiction.
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Cocaine and nicotine affect the rate of electrical self-stimulation of the brain.
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In Temporal Difference learning, we use a discrete time variable t (0 t T). The variables of the model are the stimulus u(t), the
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3_12_09_RewardAndAddiction - Unsupervised learning is...

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