Behavioral measures of cochlear compression and temporal resolution as predictors of speech masking release in hearing-impaired listeners
Behavioral measures of cochlear compression and temporal resolution as predictors of speech masking release in hearing-impaired listeners
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DOI：
10.1121/1.4818773
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发表时间：
2013-10-01
影响因子：
2.4
通讯作者：
Oxenham, Andrew J.
中科院分区：
文献类型：
--
作者：
Gregan, Melanie J.;Nelson, Peggy B.;Oxenham, Andrew J.
听力受损（HI）的听众往往表现出更少的掩蔽释放（MR）比正常听力的听众时，时间波动施加在一个稳态掩蔽，即使占整体可听度的差异。这种差异可能与HI听众的耳蜗压缩损失有关。压缩的行为估计，使用时间掩蔽曲线（TMCs），进行了比较与MR的频带限制（500-4000 Hz）的语音和纯音在HI听众和年龄匹配，噪声掩蔽正常听力（NMNH）的听众。在500、1500和4000 Hz下进行压缩和纯音MR估计。MR的量被定义为稳态和10 Hz方波门控语音整形噪声之间的性能差异。此外，从离频TMC的斜率估计时间分辨率。无论是语音或纯音，估计耳蜗压缩和MR之间没有显着的关系。NMNH的听众有显着陡峭的离频时间掩蔽恢复斜率比HI的听众，和一个小的，但显着的相关性较差的时间分辨率和减少MR语音。结果表明，听力障碍对MR的影响主要不是由外周压缩的变化决定的，或者TMC不能提供足够可靠的耳蜗压缩测量。(C)2013年美国声学学会。
Hearing-impaired (HI) listeners often show less masking release (MR) than normal-hearing listeners when temporal fluctuations are imposed on a steady-state masker, even when accounting for overall audibility differences. This difference may be related to a loss of cochlear compression in HI listeners. Behavioral estimates of compression, using temporal masking curves (TMCs), were compared with MR for band-limited (500-4000 Hz) speech and pure tones in HI listeners and age-matched, noise-masked normal-hearing (NMNH) listeners. Compression and pure-tone MR estimates were made at 500, 1500, and 4000 Hz. The amount of MR was defined as the difference in performance between steady-state and 10-Hz square-wave-gated speech-shaped noise. In addition, temporal resolution was estimated from the slope of the off-frequency TMC. No significant relationship was found between estimated cochlear compression and MR for either speech or pure tones. NMNH listeners had significantly steeper off-frequency temporal masking recovery slopes than did HI listeners, and a small but significant correlation was observed between poorer temporal resolution and reduced MR for speech. The results suggest either that the effects of hearing impairment on MR are not determined primarily by changes in peripheral compression, or that the TMC does not provide a sufficiently reliable measure of cochlear compression. (C) 2013 Acoustical Society of America.