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# 324 03 part 3.1 classical conditioning mechanisms

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### 324 03 part 3.1 classical conditioning mechanisms

1. 1. Human Learning Topic 3: Part 3 Respondent Conditioning Mechanisms and FunctionCEDP 324 Ryan Sain, Ph.D. 1 3/30/2012
2. 2. Contingency & Contiguity Contingency is a major key!  the degree of prediction from the CS to the US effects the amount of conditioning  Rescorla – p(us/cs) and p(us/no cs)  Vary these probabilities using a 2 minute tone at random intervals  .4 that the US would occur during a CS; .2 a US would occur during a no CS Contiguity also plays a role  The shorter the ISI or TI the stronger the conditioningCEDP 324 Ryan Sain, Ph.D. 2 3/30/2012
3. 3. Compound Stimuli Two or more stimuli occurring together (sound and sight - CR) then paired with a US Can test the effects of this by presenting one of the CSs alone after pairings Often you get conditioning to both But not alwaysCEDP 324 Ryan Sain, Ph.D. 3 3/30/2012
4. 4. Blocking Kamin – conditioned suppression procedure (css = light, tone, light tone; cr = shock) Two groups: blocking and control One stimulus seems to block conditioning to the other – no new predictability. Group Phase 1 Phase 2 Test Result Phase Blocking 1 Light Light/tone Tone Tone elicits no CR Control ------- Light/tone Tone Tone elicits CRCEDP 324 Ryan Sain, Ph.D. 4 3/30/2012
5. 5. Overshadowing  Intensity of the CS effects conditioning trials  Loud CS and soft CS  US = CR  Test with either CS  +CS = CR  -CS ≠ CR  But you can then use the –CS by itself and get conditioning  One seems to overshadow the otherCEDP 324 Ryan Sain, Ph.D. 5 3/30/2012
6. 6. Experience with the CS  Latent inhibition  Presence of a CS in the absence of the US  Delays acquisition in the future  Prediction is decreasedCEDP 324 Ryan Sain, Ph.D. 6 3/30/2012
7. 7. Acquisition • CR is increasing in strengthStrength of CR •Learn more on early trials than on later ones Number of trialsCEDP 324 Ryan Sain, Ph.D. 7 3/30/2012