書誌事項
- タイトル別名
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- Audiological evaluation of the middle ear implant. Temporal auditory acuity.
- TEMPORAL AUDITORY ACUITY
- 時間分解能について
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抄録
Temporal auditory acuities provided by the middle ear implant (MEI) and by the hearing aid (HA) were compared in ten patients implanted with the MEI. Test sounds used in the experiment were tone bursts [rise and fall time: 25msec, duration (t): 982-1000msec, interval (T): 1000msec] of 500Hz or 2000Hz at 70 dBSPL. A speaker was placed in front of a subject one meter apart. At first, the subject adjusted the gain control of outer unit at the most comfortable loudness level. He heard totally fifty times of the test sounds, which varied in duration each 2msec difference between 982 and 1000msec and were provided in random manner. Therefore, sound of each duration was given 5 times. The notch [=(T-t)×2] of the test sounds recognized by the patients was regarded as time gap. Fifty percent discrimination thretholds, which were indicated by the gap times of the test sounds half identified, were obtained as the index of the temporal auditory acuity. Following the above test, performance of the HA was investigated by use of the same procedure. The results indicated that the temporal auditory acuities of the MEI were superior to those of the HA at 500Hz (P<0.01) and 2000Hz (P<0.001). When the intensity of the test sound at 2000Hz decreased from 70dBSPL to 60 or 50dBSPL, the temporal auditory acuities of the MEI and the HA were almost depreciated together with consistent difference in the test of 6 patients (P<0.01, 0.05). These results indicated that audiological advantages of the MEI were to some extent due to it's superiority in the temporal auditory acuity.
収録刊行物
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- 日本耳鼻咽喉科学会会報
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日本耳鼻咽喉科学会会報 93 (3), 413-419, 1990
一般社団法人 日本耳鼻咽喉科頭頸部外科学会