C57BL/6J系マウスの同時弁別学習における刺激選択--刺激の明瞭度と有効性の効果について

概要

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Two experiments using a Y-maze examined the effects of stimulus salience and of stimulus validity upon the cue selection in mice (C57BL/6J). Mice were first pretrained in a discrimination task using one of the two stimulus dimensions (brightness or pattern) until they reached the acquisition criterion. The positive stimuli were the brighter card in the case of brightness dimension and the card with pattern in the case of pattern dimension. Then, the task was shifted to the compound-stimulus discrimination task with both of the dimensions present and the training was continued for 120 trials. In the final stage, the test was given to determine which of the two stimulus dimensions was to be selected by mice by presenting two positive cards of differing dimension simultaneously. When the brightness was much more salient than the pattern, the former was selected by all groups of mice, regardless of the difference in dimension given in the pretraining (Experiment I). When the relative salience of brightness was reduced to the level below that in Experiment I, the effect of pretraining was demonstrated (Experiment II). The results of Experiment I shows that the stimulus salience may sometimes produce stronger effect in the cue selection as compared with the stimulus validity.
公益社団法人日本心理学会の論文