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Lecture 19

PSYC 361 Lecture 19: lecture19

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PSYC 361
Catharine Winstanley

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Twoprocess learning theory Traditional way of talking about PIT is through twoprocess learning theory: o Classically conditioned stimuli associated with food evoke central emotional response (CERs) eg hope, fear, disappointment and relief o CERs affect subsequent behaviour o CERs analogous to Pavlovian incentive salience Prelimbic cortex Physiological and functional comparison for rats and humans Key aspects of goal directed behaviour: animals must understand that their actions result in the outcome. And that the outcome is a goal ie desired by the animal. Pair food with chemical or sated the animal to change behaviour Bailleine with Dickinson 1998: showed that damage to the PrL cortex (in medial wall) reduced the ability of animals to detect contingency changes Rats learned to get two kind of rewards by doing two different things. Reward was delivered with a prbability of 0.05 at the end of each second in which a response was made (once every 20s if rat responded once persecond) Contingency could be graded by delivering reward with the same probability regardless of whether the animal had made a response in that second or not Rats know which actions leads to what outcome If you damage prelimbic cortex, rats cannot figure out which action leads to which outcome. Rats with damage to PrL fail to discriminate between actions and outcomes, if one reward is presented noncontingently , they reduce responding for both rewards Orbitofrontal cortex Critchley and Rolls 1996:animals given foods they like. Neuron firing is tracked. If sated, neuron firing is decreased. Brain area that modulates firing based on subjective value and not objective value. OFC or Amygdala damage no difference in responding, carry on if devalued reward still has value
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