聴覚に及ぼすThermal Noiseの影響 : 特に純音閾値に対するThermal Noiseの影響
スポンサーリンク
概要
- 論文の詳細を見る
The author has conducted the experiment to investigate the patterns of temporary threshold shift following the one-menute, five-minutes and fifteen-minutes exposures at low, moderate and high levels to a wide banc thermal noise.The results obtained are as follows;1) The Bekesy audiometry technique applied to this investigation is considered to be the most excellent procedures for the measurements of temporary threshold shift at the present time.2) A one-minutes 40 db S.L.thermal noise exposure produces no measurable shift at all the frequencies tested.3) The 40 db S.L.thermal noise exposures both for five minutes and fifteen minutes produce the largest temporary threshold shift at 4000 cycles, its frequency distribution being 4000 cps 2000 cps 8000 cps>1000 cps in this order.4) For moderate levels of the thremal eoise exposure (up to and including 80 db S.L.) follo- wing each exposure for one-, five-, and fifteen-minutes, the magnitudes of temporary threshold shifts and its frequency distribution are found to be the largest at 4000 cps, and then decreased at 2000 cps, 8000 cps and 1000 cps in this order, While at higher levels of the exposure (90 db to 100 db S.L.), the magnitudes of temporary threshold shifts are distributed to 4000 cps>8000 cps >2000 cps>1000 cps in this order showing the maximum snift at 4000 cps.This spread of the pattern occurs principally for higher frequencies than 4000 cps at higher levels of the exposure.5) The maximum temporary threshold shift occurs always at 4000 cps following exposure not only at high levels but moderate and even low levels.
- 社団法人 日本耳鼻咽喉科学会の論文