Elsevier

Learning and Motivation

Volume 19, Issue 4, November 1988, Pages 317-344
Learning and Motivation

Information and expression of simultaneous and backward associations: Implications for contiguity theory

https://doi.org/10.1016/0023-9690(88)90044-6Get rights and content

Abstract

Five conditioned lick-suppression experiments with water-deprived rats examined the possibility that simultaneous and backward associations are learned, but are not expressed as anticipatory responses in common indexes of associative strength. Experiments 1–4 used a sensory preconditioning procedure in which clicks preceded the onset of a tone. Subsequently, the tone was paired with footshock in either a forward, simultaneous, or backward arrangement. In no case did the tone trained in the simultaneous or backward manner elicit a conditioned response. However, Experiments 1, 2, and 3 determined that the clicks, which predicted the tone, evoked equally strong conditioned responses regardless of whether the tone was paired with the shock in a forward, simultaneous, or backward manner. Experiment 4 found that responding to the clicks was degraded following postconditioning extinction of the tone, regardless of whether the tone had been paired with the shock in a forward or simultaneous manner. Experiment 5 determined that if the click and tone were paired simultaneously, the click failed a test for excitation following tone-shock simultaneous pairings but passed a test for excitation following tone-shock forward pairings. Collectively, these findings suggest that predictive information (i.e., a forward relationship between stimuli) is not necessary for the acquisition of an association, but may promote the expression of the association in an anticipatory response system. Moreover, these results suggest that associations are not simple linkages, but contain information regarding the temporal relationship of the associates.

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    This research was supported by a SUNY-Dissertation Year Fellowship to L.D.M. and NSF Grant BNS 86-00755. Some of these experiments were included in a dissertation submitted by L.D.M. to the faculty of SUNY at Binghamton in partial fulfillment of the requirements for the degree of Ph.D.

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