Some parameters of the second-order conditioning of fear in rats

Alan C. Kamil

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Investigated the effects of CS1 duration, partial reinforcement, and trace conditioning on 2nd-order conditioned suppression. Ss were 64 rats. In Exp. I the clearest 2nd-order conditioning was obtained when CS1 duration was the same during both the 1st- and the 2nd-order conditioning phases of the experiment. In Exp. II somewhat better 2nd-order conditioning was obtained when 1st-order conditioning had been under conditions of partial reinforcement, delay CS-UCS pairing. In neither experiment were CSl suppression and CS2 suppression during 2nd-order testing well correlated. This aspect of the results raised the question of the influence of nonclassical conditioning factors on the conditioned suppression measure of emotional conditioning. (PsycINFO Database Record (c) 2006 APA, all rights reserved).

Original languageEnglish (US)
Pages (from-to)364-369
Number of pages6
JournalJournal of Comparative and Physiological Psychology
Issue number3
StatePublished - Mar 1969
Externally publishedYes


  • 2nd order conditioned suppression, CS1 duration &
  • partial reinforcement &
  • trace conditioning, rat

ASJC Scopus subject areas

  • Medicine(all)


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