Brennan Marc A, McCreery Ryan W, Jesteadt Walt
Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA.
J Acoust Soc Am. 2015 Oct;138(4):2589-97. doi: 10.1121/1.4932028.
This paper describes forward-masked thresholds for adults with hearing loss. Previous research has demonstrated that the loss of cochlear compression contributes to deficits in this measure of temporal resolution. Cochlear compression can be mimicked with fast-acting compression where the normal dynamic range is mapped to the impaired dynamic range. To test the hypothesis that fast-acting compression will most-closely approximate the normal ability to perceive forward-masked pure-tones, forward-masked thresholds were measured for two groups of adults (normal hearing, hearing loss). Adults with normal hearing were tested without amplification. Adults with hearing loss were tested with three different compression speeds and two different prescriptive procedures using a hearing-aid simulator. The two prescriptive procedures differed in the extent to which the normal dynamic range was mapped onto the impaired dynamic range. When using a faster compression speed with the prescriptive procedure that best restored the lost dynamic range, forward-masked thresholds for the listeners with hearing loss approximated those observed for the listeners with normal hearing.
本文描述了听力损失成年人的前掩蔽阈值。先前的研究表明，耳蜗压缩功能的丧失会导致这种时间分辨率测量指标出现缺陷。可以通过快速作用压缩来模拟耳蜗压缩，即将正常动态范围映射到受损动态范围。为了检验快速作用压缩最接近正常感知前掩蔽纯音能力这一假设，对两组成年人（听力正常、听力损失）测量了前掩蔽阈值。对听力正常的成年人未使用放大设备进行测试。对听力损失的成年人使用助听器模拟器，以三种不同的压缩速度和两种不同的处方程序进行测试。两种处方程序在将正常动态范围映射到受损动态范围的程度上有所不同。当使用更快的压缩速度以及能最佳恢复丧失的动态范围的处方程序时，听力损失听众的前掩蔽阈值接近听力正常听众的阈值。
