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通过8只灰鼠连续9天暴露于倍频带噪声(其中心声级在4.0千赫)的不同声级中(57.65.72.80.86和92分贝)。每日6小时的噪声暴露和18小时的安静期的试验。作者观察到: 1.动物通过连续7阶段的听阈训练后,其听力反应达到90～100％正确性。过长的训练是完全没有必要的。 2.灰鼠的最大听阈损失频率为5.7千赫;即暴露噪声中心声级4.0千赫以上的半个倍频程处。其次的损失频率为8.0,2.0和0.5千赫。 3.在一天当中灰鼠的最大阈移发生在噪声暴露后4分钟时;并且常常是这种最大
Eight squirrels were exposed for 9 consecutive days to different sound levels (57.65.72.80.86 and 92 decibels) with octave band noise (center level at 4.0 kHz). 6 hours daily noise exposure and 18 hours quiet period of the test. The authors observed that: 1. The animals achieved a 90-100% correct hearing response through a seven-stage listening threshold training. Excessive training is totally unnecessary. 2. The maximum squirrel hearing loss frequency is 5.7 kHz; that is, half the octave above the noise center level of 4.0 kHz is exposed. The second loss frequency is 8.0, 2.0 and 0.5 kHz. 3. The maximum squirrel threshold shift during one day occurs 4 minutes after noise exposure; and often this is the largest