不快音の生理学的分析-2-

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Many reports have been made on the studies of the influence of noises upon a living body and it is generally accepted that noises make bodies sympathetic conditions at least. Our colleagues, Dr. Itakura and others, who made physiological analysis of unpleasant sounds, observed by GSR the influence of unpleasant sounds upon living bodies and reported that unpleasantness related rather to frequency of sound than to loudness.<BR>We made experiments, with the stomatic movement as as an index, on sounds with different frequencies with the use of rabits to observe what influence would be caused to their bodies by the stimuli of sounds with different frequencies. In this experimerit in which Saloon method was applied as an index, four kinds of sound: 250; 1, 000; 4, 500 and 15, 000c/s respectively, were given to rabits through a lond speaker. The experiment has brought the following results; (1) all unpleasant sounds repress stomachic movement, (2) as stimulus is given for a longer time, the repress effect maintains longer and (3) sound with frequency of about 4, 500 c/s gives the greatest influence on the stomatic movement.<BR>From these reasons mentioned above, we positively concluded that magnitudeo finfluence of unpleasant sounds upon living bodies depended on frequencies of sounds.
有限責任中間法人日本口腔衛生学会の論文