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Lect+17+April+8_ch9_10 - Chapter 9 Extinction of...

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Chapter 9: Extinction of Conditioned Behavior Chapter 10: Aversive Control: Avoidance and Punishment April 8
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Extinction and Original Learning Spontaneous Recovery Renewal of Original Excitatory Conditioning Reinstatement of Conditioned Excitation Retention of Knowledge of the Reinforcer
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Retention of Knowledge of the Reinforcer Review of : Reinstatement refers to the recovery of conditioned behavior produced by exposures to the unconditioned stimulus. context conditioning is: important, the role of context is to disambiguate the significance of a stimulus that has a mixed history of conditioning and extinction. Context has relatively little effect on stimuli that do not have a history of extinction.
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Retention of Knowledge of the Reinforcer Rats were trained in an experimental chamber that had two response levers. Pressing one of the levers produced a pellet of food Pressing the other lever produced a few drops of a sugar solution. During the next session, extinction was in effect for both responses for 15 minutes. Responding on both levers declined rapidly during this extinction phase. One of the reinforcers ( either a food pellet or sugar water) was then presented once and responding was monitored for the next three minutes.
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Reinstatement of Conditioned Excitation
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Reinstatement of Conditioned Excitation For subjects that were conditioned with the weak shock and did not receive extinction ( left ), it did not make any difference whether the reinstatement shocks occurred in the test context ( shock same) or elsewhere ( shock different). This outcome shows that contextual conditioning did not summate with the suppression elicited by the target CS. Weak shock; no extinction
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Reinstatement of Conditioned Excitation Subjects that received extinction ( right side), reinstatement shocks given in the same context as testing produced significantly more response suppression than shocks given in a different context. This outcome shows that context conditioning facilitates the reinstatement effect. Weak shock; extinction
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Retention of Knowledge of the Reinforcer Rats were trained in an experimental chamber that had two response levers. Pressing one of the levers produced a pellet of food Pressing the other lever produced a few drops of a sugar solution. During the next session, extinction was in effect for both responses for 15 minutes. Responding on both levers declined rapidly during this extinction phase. One of the reinforcers ( either a food pellet or sugar water) was then presented once and responding was monitored for the next three minutes.
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Retention of Knowledge of the Reinforcer Presentation of a reinforcer after extinction produced a selective recovery of lever pressing. Much more responding occurred on the lever whose associated reinforcer had been used for the reinstatement procedure.
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