Chapter 5. Chapter 5 Lectures Outline
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1 Chapter 5 Finishing up Classical Conditioning Underlying Processes & Practical Applications Chapter 5 Lectures Outline Underlying processes in Pavlovian conditioning S-R vs. S-S learning Stimulus-substitution vs. Preparatory-response theory Compensatory response model Rescorla-Wagner model Practical applications of Pavlovian conditioning Understanding the nature of phobias Treating phobias Aversion therapy 1
2 S-R vs S-S Learning S-R (stimulus-response learning) Example When a tone and food are presented together, the tone becomes associated with the salivation that occurs to the food. A direct connection is created between the CS and UR such that the CS elicits the same response as the UR Tone: CS Food UCS Salivation UR S-R vs S-S Learning cont. S-S (stimulus-stimulus learning) CS comes to activate a mental representation of the US which in turn generates the UR Example When a tone and food are presented together, the tone generates a mental representation of the food and, as result of this representation, salivation occurs. A direct connection is created between the CS and US such that the CS elicits (same) similar response to the UR Tone: CS Food US Salivation UR 2
3 The evidence for S-S vs. S-R learning Holloway & Domjan (1993) Evaluate the vigour of responding by reducing the motivation to respond to the US Sexual Pavlovian conditioning with a male quails Males motivated to copulate with receptive females Light : Receptive Female (10 trials) Light Males Very Motivated (approa ched the light!!!) Half the males - brightness in lab changed to reflect winter cond itions when birds do not copulate (re duced sex drive group) S-R model predicts the CS (light) is directly associated with the UR (copulation) If S-R is correct, reducing motivation to perform UR (light) should not influence the UR performance Holloway & Domjan (1993) - Results Reduction in motivation reduced re sponding to the CS Contrary to predictions of S-R learning mechanisms because reducing motivation to perform UR affe cted the UR Best explained by S-S theory because this does not involve learning a specific UR S-S theory association is learned between CS and mental representation of US Conditioned Approach Behaviour Normal Sex Drive Reduced Sex Drive Test Trial 3
4 Conclusions: S-R vs. S-S theory Some evidence f or both theories Majority of evidence is for S-S theory, particularly simple Pavlovian processes That brings us to WHY does Classical Conditioning exist? Perhaps it is there to help get us ready for things that are going to happen! Stimulus-substitution theory - Pavlov (1927) Preparatory-Response theory - Kimble (1961) 4
5 Stimulus-substitution theory Stimulus-substitution theory - Pavlov (1927) S-S theory of conditioning CS should elicit the same response as the US Light (CS) : Food (US) Salivation (UR) Light (CS) Salivation (CR) But shouldn t the dog try to eat the light??? Stimulus-substitution theory Jenkins & Moore (1973) Food - pigeons peck with open beak, closed eyes Water - pigeons peck with closed beak, open eyes Light (CS) : Food (US) Peck (UR) Light (CS) : Water (US) Peck (UR) According to Stimulus-Substitution hypotheses Pigeons should peck at the lighted key paired with food with Pigeons should peck at the lighted key paired with water with 5
6 Stimulus-Substitution cont. Results Pigeons tried to eat the lighted key paired with food Pigeons tried to drink the lighted key paired with water Light : Water Light : Food Seems like the CS had become the US for the birds in this study Does the CS elicit the same response US (i.e., is the CR the same as the UR)??? Preparatory Response Theory Preparatory Response Theory The purpose of the CR is to prepare the organism for the presentation of the US Sometimes the CR can be different, or even the opposite of the UR 6
7 Preparatory Response Theory Faneslow (1989) Rats placed in cage and administered foot shocks Phase 1 Foot-Shock (US) Jump (UR) Tone (NS) : Foot-Shock (US) Jump (UR) Test Phase Tone (CS) Suggests CS has not become the US different responses Perhaps evolutionary explanation Jump to actual bite; freez e (hid e) in anticipation Preparatory Response Theory Preparatory Response Theory The purpose of the CR is to prepare the organism for the arrival of the US Can explain topographical similarity of some CS to US Metronome : Food Salivate Metronome Salivate Can explain topographical dissimilarities Foot Shock Jump Tone : Foot Shock Tone Freeze 7
8 Compensatory Response Model The compensatory after-reactions to the US are elicited by the CS Pre-conditioning phase Shock (US) Increa sed Heart Rate (UR) Conditioning phase Tone(NS) : Shock (US) Increased Hear t Rate (UR) Tone (CS) Increa sed Heart Rate (CR) Extended conditioning trials Tone(NS) : Shock (US) Increased Hear t Rate (UR) Tone (CS) Can be explained by Compensatory Response Model Compensatory after-reactions to a US may come to be elicited by a CS Purpose of this is probably to maintain homeostasis in the body If compensatory processes came before the US more effective in minimising effects of US Because CS elicits compensatory responses to counter effects of US strong evidence against Stimulus-Substitution theory 8
9 Compensatory Response Model & Drug Tolerance Some CSs (neutral stimuli) begin to signal that the drug is coming Theref ore, when you see these CSs, your heart rate lowers, etc., thus moderating the effects of the drug (once you ingest it) Examples of some CSs for alcohol or drug use? Compensatory Response Model & Drug Overdose Siegel, Hinson, Krank & McCully (1982) Rats injected with heroin every second day for 30 days Alternate days injected with dextrose (sugar) solution Administered either in home room or different room Half received heroin in home room; dextrose in other room; other half received opposite injecting room order Heroin intake increased each day Third group of rats (controls) received dextrose only in both rooms Test double dose of heroin given to all animals Half experimental group in room where heroin normally received; half in other room; control group also got double dose DV = mortality 9
10 Drug Overdose - Results Context cues where the same room group normally received drug offset effects When large heroin dose administered in new context no compensatory response = mortality Opponent-process theory a-process direct effe ct of the drug b-process conditioned to the contextual cues (room) Percent Mortality % % 32% 0 Control Differe nt Same Room Room Group More Evidence for this theory McCusker and Brown 1990 Alcohol-expected vs. alcohol-unexpected environments (e.g. drinking at the office vs. drinking in a bar) Implications for drinking and driving Implications for drug overdose fatalities 10
11 Compensatory Response Model Drug tolerance Repeated use of drug in specific context b-process becomes stronger red uced net effe ct of drug need increased q uantity of drug for same effect Repeated experience with drug results in less of a high (aprocess) Drug withdrawal With repeated exposure to the drug in specific context, the b- process increases in strength & duration a-process ceases immediately but b-process declines slowly Negative effects of b-process become extreme withdrawal Compensatory Response Model Increased High Homeostasis Effects of drug After-effects of drug a-process effects of drug Net effect of drug Increased Low b-process cond itioned to context 11
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