The Effects of a Flavour - Toxicosis Pairing upon Long-Delay,Flavour aVersion Learning

Abstract

Mackintosh (1973) has suggested that rats readily associate flavours with illnesses in cue-to-consequence studies because they have already learned that changes in internal states are unrelated to changes in external stimuli. An implication of this suggestion is that learned predispositions may also subserve the ability of rats to form long-delay, flavour-illness associations. Six experiments tested this idea by examining the strengths of aversions in a delayed flavour-toxicosis paradigm after exposure to a paired or unpaired relation between another flavour and toxicosis. Exposure to a paired relation enhanced the strengths of subsequently established flavour aversions (Experiment I). The enhanced aversions were associative in origin (Experiment II), observed with delays of 3 h and 1·5 h in, respectively, a forward (Experiment III) and backward (Experiment IV) delayed conditioning paradigm and with a 10-day interval between the flavour-toxin pairing and the delayed paradigm (Experiment V). The enhanced aversions, however, were removed by the extinction of the original flavour aversion prior to the delayed flavour-toxin pairing (Experiment VI). The results supported the idea that the ability of the rat to form long-delay, flavour–illness associations reflects an associative history involving flavours and internal changes and were discussed in terms of Mackintosh's (1975) theory of the mechanism underlying stimulus selection. The effects of a flavour-toxicosis pairing upon long-delay, flavour aversion learning.

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References

Learning Mechanisms in Food Selection. Barker

L. M.

Best

M. R.

Domjan

Waco, Texas: Baylor University Press 1977.

Braveman

N. S.

(1975). Formation of taste aversions in rats following prior exposure to sickness. Learning and Motivation 6, 512–34.

Cannon

D. S.

Berman

R. F.

Baker

T. B.

Atkinson

C. A.

(1975). Effect of preconditioning unconditioned stimulus experience on learned taste aversions. Journal of Experimental Psychology: Animal Behavior Processes 1, 270–84.

Dickinson

Mackintosh

N. J.

(1978). Classical conditioning in animals. Annual Review of Psychology 29, 587–612.

Dickinson

Mackintosh

N. J.

(1979). Reinforcer specificity in the enhancement of conditioning by post trial surprise. Journal of Experimental Psychology: Animal Behavior Processes 5, 162–77.

Domjan

(1975). Poison-induced neophobia: Role of stimulus generalisation of conditioned taste aversions. Animal Learning and Behavior 3, 205–11.

Domjan

(1977). Attentuation and enhancement of neophobia for edible substances. Learning Mechanisms in Food Selection. Barker

L. M.

Best

M. R.

Domjan

Waco, Texas: Baylor University Press.

Domjan

Gregg

(1977). Long-delay backward taste-aversion conditioning with lithium. Psychology and Behavior 18, 59–62.

Domjan

Wilson

N. E.

(1972). Specificity of cue to consequence in aversion learning in the rat. Psychonomic Science 26, 143–5.

10.

Garcia

Ervin

F. R.

(1968). A neuropsychological approach to appropriateness of signals and specificity of reinforcers. Communications in Behavioral Biology 1, 389–415.

11.

Garcia

Koelling

R. A.

(1966). Relation of cue to consequence in avoidance learning. Psychonomic Science 4, 123–4.

12.

Gillan

D. J.

Domjan

(1977). Taste-aversion conditioning with expected versus unexpected drug treatment. Journal of Experimental Psychology: Animal Behavior Processes 3, 297–309.

13.

Hays

W. L.

(1972). Statistics for the Social Sciences New York: Holt, Rinehart & Winston.

14.

Heth

C. D.

Rescorla

R. A.

(1973). Simultaneous and backward fear conditioning in the rat. Journal of Comparative and Physiological Psychology 82, 434–43.

15.

LoLordo

V. M.

(1979). Selective associations. Mechanisms of Learning and Motivation: A Memorial Volume for Jerzy Konorski. Dickinson

Boakes

R. A.

Hillsdale, N.J.: Erlbaum.

16.

Mackintosh

N. J.

(1973). Stimulus selection: Learning to ignore stimuli that predict no change in reinforcement. Constraints on Learning. Hinde

R. A.

Stevenson-Hinde

London: Academic Press.

17.

Mackintosh

N. J.

(1974). The Psychology of Animal Learning London: Academic Press.

18.

Mackintosh

N. J.

(1975). A theory of attention: Variations in the associability of stimuli with reinforcement. Psychological Review 82, 276–98.

19.

Mikulka

P. J.

Leard

Klein

S. B.

(1977). Illness—alone exposure as a source of interference with acquisition and retention of a taste aversion. Journal of Experimental Psychology: Animal Behavior Processes 3, 189–200.

20.

Milgram

N. W.

Krames

Alloway

T. M.

(1977). Food Aversion Learning New York: Plenum Press.

21.

Miller

R. G.

(1966). Simultaneous statistical inference New York: McGraw-Hill.

22.

Odling-Smee

F. J.

(1975). The role of background stimuli during Pavlovian conditioning. Quarterly Journal of Experimental Psychology 27, 201–9.

23.

Randich

LoLordo

V. M.

(1979). Associative and non-associative theories of the UCS pre-exposure phenomenon: Implications for Pavlovian conditioning. Psychological Bulletin 86, 523–48.

24.

Rodger

R. S.

(1967). Type II errors and their decision basis. British Journal of Mathematical and Statistical Psychology 20, 187–204.

25.

Revusky

(1971). The role of interference in association over a delay. Animal Memory. Honig

W. K.

James

P. H. R.

New York: Academic Press.

26.

Revusky

(1977). Learning as a general process with an emphasis on data from feeding experiments. Food Aversion Learning. Milgram

N. W.

Krames

Alloway

T. M.

New York: Plenum Press.

27.

Revusky

Garcia

(1970). Learned associations over long delays. The Psychology of Learning and Motivation: Advances in Research and Theory. Bower

G. H.

New York: Academic Press Volume 4.

28.

Rozin

Kalat

J. W.

(1971). Specific hungers and poison avoidance as adaptive specialisations of learning. Psychological Review 102, 778–87.

29.

Seligman

M. E. P.

(1970). On the generality of the laws of learning. Psychological Review 77, 406–18.

30.

Wagner

A. R.

Terry

W. S.

(1975). Backward conditioning to a CS following an expected versus a surprising UCS. Animal Learning and Behavior 3, 370–4.

31.

Willner

J. A.

(1978). Blocking of a taste aversion by prior pairings of exteroceptive stimuli with illness. Learning and Motivation 9, 125–40.