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Lecture 4 - ClassConProcedures

Lecture 4 - ClassConProcedures - Pavlovian Conditioning...

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Unformatted text preview: Pavlovian Conditioning Procedures I. Excitatory Conditioning A. The CS activates behavior related to the associated US. Procedures – timing is key 1. Short­delayed – CS starts, after < 1 min, US is presented 2. Trace – CS starts and stops, after short (trace) interval US is presented Cont. Long­delayed – CS starts, after 5­10 min, US is presented 2. Simultaneous – CS and US start at same time 3. Backward – US starts first, then CS is presented Examples? 1. Cont. A. Measurement of Conditioned Responses ­ must test response to CS alone ­ magnitude (how much), probability (how often), latency (how soon) Cont. A. Control procedures Paired vs unpaired Paired CS US Unpaired CS No US Cont. Control Procedures 1. Random – CS and US presented randomly 2. Explicitly unpaired – more effective Cont. A. Requirements for classical conditioning to occur 1. spatial contiguity (except auditory) 2. temporal contiguity (except taste aversion) 3. CS must precede US 4. Biology is a limiting factor A. Examples 1. you pet a cat, it purrs 2. you hear the bell, you leave class 3. you associate the color green w money 4. you associate a hot stove with pain 5. you hear thunder, expect lightning 6. you hit snooze button, alarm goes off A. Examples of conditioned responses How would you measure learning if …? 1. a doorbell predicts company 2. a ringtone predicts an aversive person 3. a line predicts football ticket disbursement 4. 5 tequila shots predict vomit 5. a cop car predicts ticket II. Inhibitory Conditioning CS predicts ABSENCE of the US ­ there has to be an excitatory context for the US CS+ US CS+ & CS­ (at same time) No US Light (CS+) Food Light + Tone (CS­) No Food Cont. How do we measure learning in inhibitory conditioning? a. Compound stimulus test – comparison of response to CS+ alone to response of CS+CS­ (compound stimulus) – which response should be greater? ­ response to CS+ alone Cont. Training Block of Wood Food (28 trials) Wood + Tone No Food (56 trials) Test Present wood measure CR Present wood + tone measure CR ­ Measure CR by approach to wood Cont. b. retardation­of­acquisition test Training CS+ US (28 trials) CS+ & CS­ No US (56 trials) Test CS­ US (3 trials) New CS US (3 trials) ­Compare responses to CS­ and new CS Cont. Training Tone Shock (28 trials) Tone + Light No Shock (56 trials) Test Light Shock (3 trials) Blinking Light Shock (3 trials ­ Animal should freeze more to blinking light – CR to regular light has been retarded ...
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