Enhancement of flavor aversion conditioning in weanling but not adult rats by prior conditioning to an odor

Philipp J. Kraemer, Elizabeth G. Kraemer, Drew E. Smoller, Norman E. Spear

Research output: Contribution to journalArticlepeer-review


Four experiments tested the effect of signaled and unsignaled preexposure to an unconditioned stimulus/stimuli (UCS) on conditioning of a taste aversion to saccharin, which was induced by pairing the saccharin conditioned stimulus/stimuli (CS) with lithium chloride (LiCl [UCS]). Rats of 2 ages were tested: weanlings 21 days old and adults 60–80 days old. In Exp 1, preexposure to a UCS signaled by a novel odor (banana) facilitated conditioning in the weanlings but not in the adults. Exp 2 replicated these data. Exp 3 determined that saccharin-LiCl conditioning was facilitated by a prior pairing of the banana odor and LiCl, but only if the LiCl doses were the same for the signaled UCS preexposure and for the taste-aversion conditioning itself. In all experiments, a conditioned aversion was enhanced in weanlings but not adults by prior pairing of an unrelated odor with LiCl. (PsycINFO Database Record (c) 2016 APA, all rights reserved)
Original languageAmerican English
Pages (from-to)34-42
Number of pages9
Issue number1
StatePublished - Mar 1989

Bibliographical note

Accession Number: 1989-31924-001. Other Journal Title: Physiological Psychology. Partial author list: First Author & Affiliation: Kraemer, Philipp J.; State U New York, Binghamton, US. Release Date: 19891001. Correction Date: 20100104. Publication Type: Journal (0100), Peer Reviewed Journal (0110). Format Covered: Print. Document Type: Journal Article. Language: EnglishMajor Descriptor: Age Differences; Aversion Conditioning; Taste Perception. Minor Descriptor: Infants (Animal); Rats. Classification: Learning & Motivation (2420). Population: Animal (20). Page Count: 9. Issue Publication Date: Mar, 1989.


  • signaled preexposure to UCS
  • conditioning of taste aversion
  • 21 vs 60–80 day old rats
  • Age Differences
  • Aversion Conditioning
  • Taste Perception
  • Infants (Animal)
  • Rats


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