An Experimental Analysis on a Method Measuring Auditory Threshold in the White Rat
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概要
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Auditory thresholds of animals have been measured all by the conditioning methods.<BR>In 1936, NEET, C. reported that the verbal report yielded lower auditory discrimination threshold than the conditioned response. In 1937, HOVLAND, C. reported the similar results.<BR>The writer investigated whether the spontaneous activity level could be used as an index to determine the upper and the lower auditory thresholds of the white rat. The general activity decreased on the presentation of auditory stimuli. It was assumed that the auditory stimulus was perceived by the rat when the general activity decreased on presentation of an auditory stimulus.<BR>The upper and lower auditory thresholds of the white rat were determined using the general activity as an index. The upper one was estimated within the range of 18, 000 and 19, 000 cps and the lower one was within 40 to 30 cps.<BR>The results were compared with these obtained by the method of avoidance learning to examine the hypothesis mentioned above. It was found out that both results are almost the same.
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