Successive acquisitions and extinctions in the rat as a function of number of nonrewards in each extinction session.

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Abstract
Gave 2 groups of 11 female albino Holtzman rats a daily acquisition-extinction-reacquisition session for 20 consecutive days in a discrete-trials lever-press situation. In both groups the preextinction acquisition series in each session consisted of 7 rewarded trials while the postextinction acquisition series consisted of 9 rewarded trials. In 1 group (Group 12) the extinction series was 12 consecutive nonrewarded trials; in the other (Group 24) the extinction series was 24 trials. Group 12 exhibited more improvement in acquisition performance across sessions than did Group 24. In extinction Group 12 showed a decrease in extinction rate over sessions, both for the early and late nonrewarded trials in each extinction series. Group 24 showed a decrease in extinction rate over sessions only on late nonrewarded trials in the extinction series, i.e., those immediately preceding reacquisition, but an increase in extinction rate on early extinction trials. A theoretical analysis derived from the sequential hypothesis described these results quite satisfactorily. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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