Abstract
Preexposure to two compound flavors (AX and BX) typically enhances their discriminability: An aversion conditioned to AX will generalize less to BX, especially if the preexposure regime has involved alternated presentations of AX and BX rather than presenting all AX trials before BX trials (or vice versa). One possible explanation of this finding is that alternating preexposure establishes inhibitory associations between the two unique features A and B, thus counteracting the generalization produced by excitatory associations between X and A and between X and B, which might result in either the retrieval of B on a conditioning trial to AX, or the retrieval of A on a test trial to BX. Three experiments on flavor aversion conditioning in rats tested these predictions. Experiment 1 suggested that the more important of these excitatory associations was that which allowed X to retrieve A on the test trial to BX. Experiment 2 suggested that the more important inhibitory association was that which allowed B to inhibit the representation of A on this test trial. Experiment 3 provided direct evidence of the role of this inhibitory B⊣A association.
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This research was supported by a grant from the Biotechnology and Biological Sciences Research Council to N.J.M., C.H.B., and I. P. L. McLaren.
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Bennett, C.H., Scahill, V.L., Griffiths, D.P. et al. The role of inhibitory associations in perceptual learning. Animal Learning & Behavior 27, 333–345 (1999). https://doi.org/10.3758/BF03199732
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DOI: https://doi.org/10.3758/BF03199732