Human Learning Topic 3: Part 3 Respondent Conditioning Mechanisms and FunctionCEDP 324 Ryan Sain, Ph.D. 1 3/30/2012
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
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
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
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
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
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
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