Lect+16+April+6_ch9 - Chapter 9: Extinction of Conditioned...

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Chapter 9: Extinction of Conditioned Behavior April 6
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Overview Clarifications Effects of Extinction Procedures Extinction of Original Learning What is Learned in Extinction Resistance to Change and Behavioral
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Midterm 2 summary Midterm 2 Exam Grades 0 5 10 15 20 25 30 35 40 raw score (x/55) Number of student s 0 20 40 60 80 100 120 140 160 180 5 1 0 1 52 02 53 03 54 04 55 05 56 06 5 Cumulative y Mean 35 (~63%) Std Error 0.617 Std Dev. 7.926 Count 165.000 https://secure.fas.rutgers.edu/apps/gradebook/ Exam 3/25/2010 55multiple choice questions Raw Scores
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Midterm 1 0 10 20 30 40 50 60 mi dterm 1 raw scores Frequency 0 50 100 150 200 0 5 10 15 20 25 30 35 40 45 50 55 Cumulative Frequenc y Descriptive Statistics for: Input Range = cl_e1!$G$1:$G$169 mid term 1 raw scores number % Mean 33.3 ~67 Median 33.5 Mode 33.0 Std Error 0.5 Std Dev. 6.3 Count 168.0
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Midterm 3, Final Grades Midterm 3 ± Tuesday, April 13 (Ch 8,9,10) Final ± Thursday, May 6 (8-11 pm; cumulative; ~100-150 questions ) How will the course grade be determined? E1+E2+E3/ total number of possible points Will assigned letter grade. You: (34+35+50)/(50+55+55) 119/160 = 74% Class: (34+35+35)/(50+55+55) 104/160 = 65%
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Midterm 3 Midterm 3: ± Emphasis will be on figures (concepts) ± Key terms (facts) Multiple choice and T/F
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Interactions Between S+ and S-: Peak Shift Effects of intradimensional discrimination training on stimulus control
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Interactions Between S+ and S-: Peak Shift Peak of intradimensional generalization gradient will not be at S+. Peak will be at a stimulus farther removed from S+ Why is this interesting? ± Highest rate of pecking occurs to stimuli that were never presented during the original training.
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Interactions Between S+ and S-: Peak Shift Phenomenon is called peak shift . Shift of the peak generalization gradient away from the original S+ Result of intradimensional discrimination training. Peak shift did not occur in the control group. Biggest shift if S+ and S- were very close together. Not as obvious of a shift if S+ and S- were farther apart. Highest rate of pecking occurs to stimuli that were never presented during the original training.
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What Is Learned in Discrimination Training??? Discriminate different kinds of fruits.
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Spence’s theory of discrmination learning Mean number or responses Stimuli S+
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Spence’s theory of discrmination learning Mean number or responses Stimuli S+ S+ S- S-
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Generalization Gradients We can study a the extent of an organism’s generalization by presenting it with a stimuli that differ in varying degrees from the training stimuli S+ ± Stimulus the signals the availability of reinforcement ± Excitatory generalization gradient ² Stimuli that differ from S+ should be progressively less effective in evoking the instrumental response
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Generalization Gradients S- ± Stimulus that signals the lack of reinforcement ± Inhibitory generalization gradient ² Stimuli that differ from S- should be progressively less effective in inhibiting the instrumental response
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Reminder of wavelengths
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Responses Wavelength of light Brightness of light S+ S+ AB ->The gradient in A is peaked; indicates control of responding by wavelength of light.
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Lect+16+April+6_ch9 - Chapter 9: Extinction of Conditioned...

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