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Lecture 5

Thursday, Sept 20/2012 - Lecture 5 Notes.doc

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PSYC 2330
Francesco Leri

Thursday, September 20, 2012 PSYC 2330 Lecture 5 Is it really S-S* learning Pseudo-conditioning is increased responding to the CS that might occur because of mere exposure to the US o It could be that the animal did not make the connection between the predictor and the stimulus o Instead of the animal salivating because they think the bell predicts food, they are salivating because they are simply now overexcited about bells o Generalization o Criticism has been disproven o Trials when the CS has no predictive power do not produce conditioning A stimulus that is not significant is used in conditioning as the conditioned stimulus, which then becomes a predictor for a biologically event Sensitization to CS o Suggests that if you present the stimulus multiple times it will create sensitization regardless of whether there was a US paired with it o Disproven - When the stimulus is presented without a significant stimulus as well produces no conditioning S-R learning o Classical conditioning suggests that the animal is making a link between one stimulus and the other in the brain o Pavlov theorized that the activation of the CS center activated the UCS center which activates the CR center o May be that the animal is learning a predictive connection or may be that the stimulus directly activates the response without being a predictor at all. To the animal, then, the bell literally becomes food Post-Conditioning Devaluation (US Devaluation) Rescola (1973): Light (CS) conditioned with a loud noise (US) Phase 1 Phase 2 Phase 3 CS-US CS produced a CR CS-US Exposure to US CS did not produce a CR By devaluing the US, predictors no longer cause a response The mouse became habituated to the noise in phase 2 (Which devalued the CS) Phase 1 Phase 2 Phase 3 CS-US CS produced a CR CS-US US & sickness CS did not produce a CR Because devaluation occurs, we believe that classical conditioning creates a predictive link between two stimuli CS-CS Associations Second Order Conditioning o First Order CS = tone o First-order conditioning = tone --> food  Test: tone induces salivation o Second-order CS = light o Second-order conditioning = light ---> tone  Test: Light induces salivation • Sensory Preconditioning o Sensory pre-conditioning = tone light o Conditioning = tone ---
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