学習・行動における禁止の研究
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概要
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It is known that the Pavlovian internal inhibition of a conditioned response possesses and inhibitory potential on other S-R connections. However, whether the inhibition produced by experimental extinction has the same inhibitory power as that of internal inhibition is open to questions, because the inhibition by extiction differs from the inhibition of other types in several respects, for example, only the former shows spontaneous recovery. The present experiment was undertaken to answer this question and find further partcularities of the inhibitory process by extinction if any.<BR>Twelve rats were trained in bar-pressing upon the presentation of either light or sound in the Skinner box. After attainment of criterion, the response connected to the sound stimulus was subjected to exinction. Reaching the extinction criterion, i. e., 5 successive non-responses, the rats were divided into two groups, experimental and control. Immediately after grouping, test-extinction for the light stimulus was run, in which the light stimulus was presented alone for the control group, whereas the light was accompanied by the sound for the experimental group. Next day, the same procedure was repeated for both groups, i. e., the 2nd extinction and the 2nd test-extinctions.<BR>Result : The mean number of responses and the mean latencies per trial were shown in Fig. 1 and 2, and Table 1 gives the result of t-test based on those values. An insignificant difference between two groups during acquisition and the first extinction indicated that the two groups were homogeneous. Moreover, two groups were not significantly different from each other in test-extiction. This seemed to mean that the stimulus to which extinction was performed did not accelerate other extinction. But the test-extinction was faster than the preceding extinction in both groups.<BR>It was concluded that the stimulus involved in extinction would not have a power to inhibit other S-R connections, and that the tendency of non-responding built in extinction simply transferred to other conditioned responses.
- 公益社団法人 日本心理学会の論文