Effects of prior exposure on conditioned taste aversion in the rat: Androgen- and estrogen-dependent events

Christopher J. Earley, B. E. Leonard

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Studied the effects of preexposure and gonadal hormone manipulation on the extinction of a conditioned taste aversion in 198 male Sprague-Dawley rats. In Exp I, Ss were given 1 prior exposure to sucrose at some selected time (Days 4, 2, or 1) before a 2nd exposure (Day 0) to sucrose and a LiCl injection, or they were given only a single exposure (Day 0). Under single exposure, castrated Ss extinguished the aversion faster than either testosterone-treated castrated Ss or sham-operated Ss. In Exp II, estradiol, dihydrotestosterone, and testosterone were studied by using only a Day 1 preexposure condition. The testosterone-treated group maintained the aversion for the longest period, followed by dihydrotestosterone-treated, sham, castrated, and estradiol-treated groups. In Exp III, estradiol was administered alone or in combination with 2 doses of dihydrotestosterone. Findings indicate that the outcome of behavior was dependent on the ratio of estradiol to dihydrotestosterone, with variations in this ratio resulting in fast (estrogen effect) to slow (androgen effect) rates of extinction. (27 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved).

Original languageEnglish (US)
Pages (from-to)793-805
Number of pages13
JournalJournal of Comparative and Physiological Psychology
Issue number5
StatePublished - Oct 1 1979
Externally publishedYes


  • preexposure conditions, extinction of conditioned taste aversion, castrated male rats
  • testosterone vs dihydrotestosterone &/vs estradiol &

ASJC Scopus subject areas

  • Medicine(all)


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