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題 名 | Distortion-Product Otoacoustic Emissions Suppression Tuning Test=變頻耳聲傳射的抑制測驗 |
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作 者 | 林鴻清; 徐銘燦; | 書刊名 | 聽語會刊 |
卷 期 | 12 1996.12[民85.12] |
頁 次 | 頁25-32 |
分類號 | 416.812 |
關鍵詞 | 耳聲傳射; 抑制測驗; |
語 文 | 英文(English) |
英文摘要 | Otoacoustic semission can be suppressed by an additional stimulus and this suppression shows frequency selectivity. There are several aims of this study. The first is to assess if distortion-product(DP)suppression test with 4fixed f3 areas can be achieved in normal subjects. The second is to check if this simple DP suppression test can be completed in a reasonable time. The third is to assess if this simple test represents normal cochlea frequency selectivity. DP suppression tuning tests were performed in 20nornally hearing subjects. DPOAE were elicited by f1and f2, with a ratio of f2/f1=1.25. The f2 was fixed at 1 KHz respectively for 1KHz, 2KHz and 4KHz suppression test. L1=65and L2=60 dB SPL were used. Then, 4 f3 frequency were selected randomly, but reasonably. The 6 dB isosuppression tuning curve can be achieved from these 4 fixed f3 areas. The average success rate of STC measurement was 82% for normal subjects. About 5-10 minutes was required for each DP suppression test. With increasing primary frequency, higher intensity of suppression level at STC tip was needed and the mean was 60.8, 61.5 and 64.9 Db SPL for test with f2=1KHz, f2=2KHz and f2=4KHz respectively. Asymmetrical V-shaped STCs were plotted for each frequency tested. The high-frequency slope was steeper than low-frequency in the 3 average STCs. The shape of the average STC became sharper progressively with increasing primary frequency. The DP suppression test method with 4fixed sites was successful in normal subjects. The test time required was not too long for clinical use. This test apparently represented normal cochlea frequency selectivity, too. It will be possible that this test may become a useful tool for clinical research. |
本系統中英文摘要資訊取自各篇刊載內容。