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Document Type

Article

Abstract

Two experiments examined effects of overtraining on shift
learning in a matching (or nonmatching) discrimination. In
Experiment 1, rats were trained with either a matching or
non matching discrimination to criterion, or were overtrained, and
then transferred to either nonshift (i .e., matching to matching or
nonmatching to nonmatching with new stimuli but same rule: MM
and NN), shift-1 (i .e., matching to nonmatching or nonmatching to
matching with same stimuli but new rule: MN-1 and NM-1), or shift-
2 (i .e., matching to nonmatching or nonmatching to matching with
both new stimuli and new rule: MN-2 and NM-2). Group MN-2
learned the shift faster than Group NN, whereas Group MM
learned the shift faster than Group NM-2 after criterion training, but
this difference failed to reach significance. By contrast, Group MM
learned the shift faster than Group NM-2, and Group NN learned
the shift faster than Group MN-2 after overtraining. In Experiment
2 rats were overtrained with either a 1-s delayed matching or
nonmatching discrimination, and then transferred to nonshift (MM
and NN) or shift (MN and NM). Group MM learned the shift faster
than Group NM, and Group NN learned the shift faster than Group
MN. These findings indicate that overtraining results in symmetry
of transfer effect in both a simultaneous and a 1-s delayed
matching (nonmatching) discrimination.

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