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Lecture 19

PSYC 361 Lecture Notes - Lecture 19: Certified Emission Reduction, Incentive Salience

1 pages36 viewsSpring 2018

Course Code
PSYC 361
Catharine Winstanley

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Two-process learning theory
Traditional way of talking about PIT is through two-process 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
non-contingently , 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
OFC or Amygdala damage no difference in responding, carry on if devalued reward still has value
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