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Trace conditioning in 1-day-old rats

✍ Scribed by Kelly A. Bordner; Norman E. Spear

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
142 KB
Volume
48
Category
Article
ISSN
0012-1630

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✦ Synopsis

Abstract

A recent test of 3‐hr‐old rats indicated surprisingly effective trace conditioning with a 60‐s trace interval. The present study tested similar trace conditioning in pups 24‐hr‐old, in the absence of circumstances that immediately follow birth and might promote cognition. In Experiment 1 pairing an olfactory CS with a gustatory US yielded conditioning despite a 120‐s trace. Experiment 2 determined that ambient CS odor remaining in the vicinity of the conditioning surface was not sufficient to result in the olfactory–gustatory association. Experiment 3 applied conditioning procedures more like those previously used for the 3‐hr‐old infant and more stringent than those applied in Experiment 1. With these procedures the 24‐hr‐old pups nevertheless acquired the CS–US contingency with a 60‐s trace. Perhaps perinatal tolerance for long trace intervals is linked to their substantial experience in dealing with odors and tastes prenatally and postnatally. © 2005 Wiley Periodicals, Inc. Dev Psychobiol 48: 58–70, 2006.

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