聴覚疲労に関する実験的研究
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概要
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The author observed temporary threshold shift of thehearinga fter the exposure of the person with normal hearing to an intensive pure tone stlmuli. The threshold shift (temporary loss) returned rapidy toward the normal for a certa nextent within 3 minutes, and then the threshbld remained at a relatively constant. 1evel of hearing loss.The rapid recovery at the heginning was thought to be adaptation process and the hearing loss 3 minute after the stimulation was thought due to fatigue. Therefore, the author measured threshold levels 3 minutes after the exposure to pure tone stimuli.The 1argetr the intensity of stmut ating, tone, the more.1oss in hearig was observed. However, it was found by the author, s observations. that the fatigue increased unpropotionally with the icrease o fintensity of stimulating tone when thetemporary Ioss over 20db. There fore, theauthot considered the 20db Ioss as "critical level".From thiss tand pdint of view, the author measured intens ities of pure tonealld. noise to produce 20db loss and obtainedacurve of critical maximal safty leve1.Theshapeoft.he curve was revealed as inversely propotional to that of the resonan cecurve of the extemal auditory canal.The fatigue produced byvarious pure tone was compared with those various bandn noise (including the frequency of test tone in its cenre of band and being measued at the same level of test tone).The fatigue for band noise was found to be 5db less that of pure tone. subsequently, maxilnal safty level of intenslty of the nose was also decided by the additional study.
- 一般社団法人 日本耳鼻咽喉科学会の論文