Psyc_351_Section_40_-_Summer_2011_-_Class_5_-_Classical_conditioning_-_Mechanisms_Compatibility_Mode

Psyc_351_Section_40_-_Summer_2011_-_Class_5_-_Classical_conditioning_-_Mechanisms_Compatibility_Mode

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5/12/2011 1 Classical Conditioning: Mechanisms Chapter 4 What determines the nature of the CR? 3. The CR is determined by the CS - We discussed some effects of the CS on the probability of getting a CR, but what about the form of the CR? What determines the nature of the CR? 4. The Behavior Systems approach: - In order to understand “real” animal behavior we need a broad, systematic view - In many cases the organism’s reaction to the environment is organized in specific behavior systems that evolved in order to increase chances of survival (mating, feeding, etc.)
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5/12/2011 2 What determines the nature of the CR? 4. The Behavior Systems approach: - Classical conditioning overlays the CS-US relationship on an existing behavioral system that is activated by the US - i.e., as the CS becomes associated with the US, it activates the same behavioral system that is usually activated by the US - Example: Akins (2000), male quail sexual behavior. CR to cue paired with female quails is affected by the CS-US interval (search vs. approach and contact) The theory explains why: 1. The CR is determined by the US 2. The CR is also determined by the nature of the CS How does the CS produce a response? Two possibilities: 1. Conditioning establishes a new stimulus-response connection between the CS and the CR: S-R learning 2. Conditioning results in activation of a “US center” in the brain (representation of the US) by the CS: S-S learning How can we decide? US devaluation Rescorla (1975) CR CR CS US CS US Test Expt. group Control group CR US CS CR US US US CS US US Habituation Conditioning Devaluation Surprise and Classical Conditioning
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5/12/2011 3 Surprise and Classical Conditioning Surprise and Classical Conditioning Surprise and Classical Conditioning The Kamin blocking effect + I II Test + A B A B A Control group Experimental group B B
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5/12/2011 4 Surprise and Classical Conditioning The Kamin blocking effect Test results: Conclusions : Pairing of CS with US is not enough for association For new learning to occur, the US must be 0.0 1.0 2.0 3.0 Control Light+Tone Licks/min Experimental Light Surprise and Classical Conditioning The Rescorla-Wagner model (1972 ) Surprise occurs when an event turns out different from expectations When the US is “bigger” than expected, the result is excitatory conditioning When the US is “smaller” than expected, the result is inhibitory conditioning Rescorla and Wagner proposed a mathematical model for Classical
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Psyc_351_Section_40_-_Summer_2011_-_Class_5_-_Classical_conditioning_-_Mechanisms_Compatibility_Mode

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