NITTSに関する実験的研究
1988 年 31 巻 3 号 p. 183-193
詳細
1988 年 31 巻 3 号 p. 183-193
NITTS of the otological by normal young adults was measured under the following conditions in order to obtain the data with which one can predict the occurrence of NITTS in a subject.
Method: The exposing noise was a narrow band noine (center frequency at 3kHz) and TTS was measured at 4kHz.
Results:
1. It was found to be appropriate to measure TTS2 by every 2dB step of the test sound after the sound of 96dB (SPL) was given for 3 minutes.
2. The exposure of 101dB (SPL) for 3 minutes was found to be inappropriate as a measuring condition because the load was too strong for this study.
3. The exposure of 96dB (SPL) for 1 minute was found to be inappropreate as loading condition, because the load was too weak for this study. The exposure of the save noise for 3 minutes was suitable for this study.
4. After the loading of 3 minute 96dB (SPL) noise, the modal value of TTS2 lay between 4dB inclusive and 6dB exclusive.
5. There was no noticable trend about the test time zone and the subject's sex.
