一過性聴力損失に対する中枢因子と性差との関連

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The purpose of this study was to make clear the influences of the central factor to temporary threshold shift (TTS). Since we had found the sexual difference on TTS, this study was undertaken to know the relationship between the central factor and the sexual difference to TTS, too. We used the left ear of healthy 5 females and 5 males aged from 25 to 30 years for this experiment. When they were exposed to noise for inducing TTS, their psychological status were settled in 2 conditions; one is "relax" and the other is "attention". The "attention" condition was formed by the task aiming the target of the apparatus for describing the function of concentration maintenance (Takakuwa's apparatus). At the first experiment, exposed noises were continuous white noise (WN), puls noise (PN) and 4000 cps pure tone through the ear-phone. Duration of exposure was 3 minutes and exposed intensity was 40 dB in all the conditions. Test tones were 4000 cps at 40 dB exposure, and 4000 cps & 6000 cps at 90 dB exposure. At the second experiment, the exposed noises were of various intencities of 1000 cps and 4000 cps through the ear-phone. The duration of exposure in each experiment was 3 minutes. The test tones were 1500 cps at the 1000 cps exposure and 6000 cps at the 4000 cps exposure. The following results were obtained. 1) In the "relax" condition, the sexual differences on TTS and their recovery were seen at each exposure of the first experiment without pure tone 90 dB exposure, test tone 6000 cps. That is, TTS in the female was smaller than that in the male and their recovery in the female was more rappid than that in the male. 2) But, at pure tone 90 dB exposure, test tone 6000 cps, we could not see the sexual differences on TTS and their recovery. 3) At each exposure of the first experiment without pure tone 90 db exposure, test tone 6000 cps, in the male, TTS in "attention" was smaller than that in "relax", but, in the female, TTS was not significantly different between "relax" and "attention". 4) Both in the female and the male, at pure tone 90 dB exposure, test tone 6000 cps, TTS in "attention" was larger than that in "relax" and their recovery in "attention" was slower than that in "relax". The above-mentioned observations show the following points; i) The central factor affected TTS. ii) The effect of the central factor on TTS was changed by the difference of the character and intensity of the exposed noise. iii) Sexual difference was found in the mode of the effect of the central factor on TTS. 5) In the exposure of 1000 cps noise, TTS under "attention" was smaaller than that under "relax" at 80 dB exposure, and then, TTS under both conditions were similar at 85 dB exposure. On the contrary, at 90 dB exposure, TTS under "attention" was larger than that under "relax". 6) In the exposure of 4000 cps noise, TTS under "attention" was smaller than that under "relax" at 70 dB exposure, and then, TTS under the both conditions were similar at 80 dB exposure. On the contrary, at 85 dB exposure, TTS under "attention" was larger than that under "relax". By these observations, it became certain that the effect of the "attention" on TTS showed an inhibitory attitude at the low intensity exposure, but it was accelerative at the high intensity exposure.
社団法人日本産業衛生学会の論文
1967-01-20

一過性聴力損失に対する中枢因子と性差との関連

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