PSYC_351_Setion_40_-_Summer_2011_-_Class_9_Compatibility_Mode_

PSYC_351_Setion_40_-_Summer_2011_-_Class_9_Compatibility_Mode_

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5/26/2011 1 Instrumental conditioning: Foundations Chapter 5 Instrumental conditioning Fundamental elements of instrumental conditioning 3. The Response-Reinforcer Relation: Understanding of the response-reinforcer relation is critical for efficient goal- directed behavior. We do not want to invest time and energy in behaviors that do not contribute to the goal. Instrumental conditioning Fundamental elements of instrumental conditioning 3. The Response-Reinforcer Relation: a) Temporal relations : The time between the response and the appearance of the reinforcement. When the reinforcer appears immediately after the response - temporal contiguity b) Response-reinforcer contingency: To what extent the response is necessary and sufficient for the occurrence of the reinforcer
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5/26/2011 2 Instrumental conditioning Fundamental elements of instrumental conditioning 3. The Response-Reinforcer Relation: a) Temporal relations: The effect of the response-reinforcement interval Dickinson et al 1992 0 5 10 15 20 20 40 60 Reinforcement delay (sec) Instrumental conditioning Fundamental elements of instrumental conditioning 3. The Response-Reinforcer Relation: a) Temporal relations: The effect of the response-reinforcement interval Why would reinforcement delay affect have such an effect on learning? 1. Other behaviors preformed during the interval might interfere 2. The organism treats the reinforcer as independent of the response, and will engage in other behaviors that are relevant to the reinforcer (e.g., food seeking) 3. Blocking effect by context-reinforcer association (classical conditioning) Instrumental conditioning Fundamental elements of instrumental conditioning 3. The Response-Reinforcer Relation: a) Temporal relations: The effect of the response-reinforcement interval Is it possible to overcome the delay effect? 1. Secondary (conditioned) reinforcement Verbal prompts can provide immediate reinforcement Bridge a delay between the response and the primary reinforcer
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5/26/2011 3 Instrumental conditioning Fundamental elements of instrumental conditioning 2. Marking the target instrumental response Lieberman et al (1979): Marking They tested whether rats could learn a correct turn or choice in a maze despite a long delay of reward Instrumental conditioning Fundamental elements of instrumental conditioning Start Box Choice Box White Black Delay Box Goal Box Subjects were placed in the start box and allowed to choose one of two alleyways (White was correct) Three groups: Group 1: Light – after they made a choice, rats in this group received a 2 s light (regardless of choice) and were allowed to go to the delay box Group 2: Noise – treated the same, except 2 s noise Group 3: Control – no stimulus; went directly to delay box after the choice All rats confined to the delay box for 2 min, then allowed to go to the goal box. Food was given, but only if they had chosen white.
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This note was uploaded on 06/02/2011 for the course PSYC 351 taught by Professor Panagopoulos during the Summer '11 term at Concordia Canada.

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PSYC_351_Setion_40_-_Summer_2011_-_Class_9_Compatibility_Mode_

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