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噪声引起入耳的同化性质改变常常比其听阈改变还要发生得早。而这种同化性质改变的特性不是能用通常的测听方法所能测量的,它是通过记录受试者对其听阈以上的各种试验声最小声级变化的感觉能力来测量的。响度识别指标改变的试验就是用来测量这种特性的好方法。众所周知,噪声引起人的听力暂时性阈移在噪声暴露后一小时之内是在迅速的减退,但是响度识别指标的改变在这个时期还处于相当稳定阶段,可见用响度识别指标改变试验来发现对噪声敏感个体则更为实际些。由于响度识别指标改变试验是
Changes in the nature of the assimilation caused by noise often occur earlier than changes in the threshold. This change in the nature of the assimilation is not measurable by normal audiometry, as measured by the ability of the subject to perceive changes in the minimum sound level of the various test sounds above his or her hearing threshold. A test that changes the loudness recognition index is a good way to measure this property. It is well-known that the temporary threshold of human hearing caused by noise is rapidly declining within one hour after noise exposure, but the change of loudness recognition index is still at a fairly stable stage during this period. It can be seen that the loudness recognition index change experiment finds that Noise-sensitive individuals are more realistic. As the loudness recognition index change test is