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Document Type

Article

Abstract

This experiment examined the whole-partial effect of
overtraining in concurrent discriminations using two different sensory
modality tasks (tactual and visual task) and assessed the effect
against single discrimination training in rats. Overtraining facilitated
reversals in both Group W, in which rats were given concurrent
training on two tasks in the original learning before both tasks were
reversed, and Group S, in which rats were trained only on the tactual
task before it was reversed. Overtraining retarded reversal in Group
P, in which rats were given the same training as in Group W in original
learning, but only the tactual task was reversed. After overtraining,
Groups Wand S reversed more rapidly than Group P. After criterion
training, Group P reversed more rapidly than Group W, which
reversed more rapidly than Group S. These findings indicate that rats
form stimulus classes (i.e., cross-modal stimulus classes) between
the discriminative stimuli of two different sensory modalities with the
same response assignment during overtraining in two concurrent
discriminations as well as between the discriminative stimuli of the
same sensory modality.

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