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103_4_full - PSYC 103 Winter 2010 Lecture 4 Nature of...

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PSYC 103 Winter 2010 Lecture 4
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2 Nature of associative learning A memory model of associative learning - Detection of the CS or the US in the sensory register excites a memory representation of these events -The US also activates a response to produce the UR -Learning can result in S-R associations ( e.g. Aplysia ) or CS-US associations
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What is learned? S-R learning : CS elicits CR directly S-S learning : CS activates representation of US Two theories
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S-S / S-R Differentiation
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5 CS-US learning: Colwill & Motzkin (1994): Rat subjects Nature of associative learning A memory model of associative learning Conditioning Devaluation Test Tone Food Light Sucrose Food Illness Sucrose nothing Tone vs. Light Weaker responding to Tone than Light - Results are consistent with CS-US account of learning but are difficult to explain with an S-R account of learning - Holland (1990) conducted a similar experiment and found, in the final test stage, that when allowed to drink water during the test stimuli, rats made ingestive responses (e.g paw licking) to the stimulus whose US had not been poisoned, and aversive responses (e.g. head shaking) to the other stimulus
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US devaluation: Example Holloway and Domjan 1993 Sexual Pavlovian conditioning in the domesticated quail Light (CS) paired with access to female Copulation at the end of the trial --> Light elicits approach response What happens when drive is reduced?
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7 Types of stimulus-stimulus learning A. Serial conditioning B. Sensory preconditioning - A sequence of stimuli precedes the US, e.g.: Light Tone Food Holland & Ross (1981) showed that after such training, the response normally evoked by the light (e.g. rearing) was replaced by the response normally evoked by the tone (e.g. head jerking) - The presence of the light excites a memory of the tone and causes the rat to respond as if it were present Stage 1 Stage 2 Test Light Tone Tone Shock Light Rizley & Rescorla (1972): At test, the light excites a memory of the tone, which in turn excites a memory of shock Fear CR
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8 Types of stimulus-stimulus learning C. Second-order conditioning Stage 1 Stage 2 CS1 US CS2 CS1 CS2 comes to evoke a CR - CS2 enters into an association with CS1, which in turn excites a memory of the US as a consequence of stage 1 training. - Rashotte, Griffin & Sisk (1977): Autoshaping procedure with pigeons. White and blue key-lights as CS1 and CS2. CS1 extinguished after stage 2. Results showed that CR to CS was weakened by this treatment. Supports the above analysis.
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