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PSC101_Fall10_Lecture+3_handouts

PSC101_Fall10_Lecture+3_handouts - 1 2 Today Introduction...

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10/25/2010 1 Introduction to Psychobiology: Lecture 3 Becky Morgan UC Davis October 27, 2010 1 Today: Chapter 11 B.F. Skinner Operant Conditioning Chapter 12 Stress 2 Skinner Box (original) 3 How do you get rat to push lever? Successive Approximations Slowly guide rat to desired behavior 1. Release food to attract rat 2. Response 1 (R1): Approach intelligence panel 3. Tape food to wall to get R2: Rear and touch lever 2. R3: Lever pressing 4
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10/25/2010 2 Successive Approximations Shaping Adjusting response Chaining Adding responses together R1+R2+R3 Each response is shaped Video: Hime the Cat 5 Cumulative Record Data = rate of responding 6 Time Responses Extinction Extinction Decrease of response when reward ceases Conditioned inhibition Food stops Reinforcement Increase the rate of responding Motivation Animal must choose to participate Extinction Decrease of response when reward ceases Should we reinforce every behavior? 7 (Always same # or time) Schedules of Reinforcement Ratio: Depends on # of lever presses Interval: Depends on time till relay opens allowing food 8 “scalloping”
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10/25/2010 3 Positive & Negative Reinforcers All reinforcers increase the response rate Positive reinforcers: Work to obtain something desired Adding Negative reinforcers: Work to remove/prevent something aversive Subtracting
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