Acquisition and transfer of a higher-order conditional discrimination performance in the Japanese monkey

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Two Japanese monkeys were trained on a higher-order conditional discrimination task with two colors (red and purple) which consisted of a matching-to-sample and an oddity-from-sample discrimination. External stimuli (patterns on a key, etc.) served as conditional discriminative stimuli for matching and oddity. Both subjects mastered this complex task. Then, the stimulus control established in the training was examined with test trials inserted among baseline trials. Subjects correctly responded on the test trials in which the incorrect comparison stimulus specified by the sample was no longer presented. However, subjects could not respond correctly when both sample and comparison stimuli were replaced with two new colors (yellow and yellowgreen). Thus, no evidence that the identity-difference relation of stimuli controlled the subjects' responding was obtained even in the presence of the higher-order conditional discriminative stimuli controlling their matching and oddity responses. These results suggested that the specific relation between the sample and the correct comparison stimulus mainly controlled two-color matching and oddity behaviors of Japanese monkeys.
公益社団法人日本心理学会の論文