Overshoot in normal-hearing and hearing-impaired subjects.
Overshoot in normal-hearing and hearing-impaired subjects.
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正常听力和听力受损受试者的超调。
DOI：
10.1121/1.402967
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Gail A. Takahashi
中科院分区：
文献类型：
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作者：
S. P. Bacon;Gail A. Takahashi
在4名听力正常受试者和5名永久性感音神经性听力损失受试者（2名单侧听力损失）的双耳中测量过冲。掩蔽噪声为400 ms宽带噪声，频谱电平为20、30或40 dB SPL。该信号是一个10毫秒的正弦曲线提出1或195毫秒后，开始的掩蔽。信号频率为1.0或4.0 kHz，将信号置于受损耳朵的正常（1.0 kHz）或受损（4.0 kHz）绝对灵敏度区域。对于听力正常的受试者，信号频率和掩蔽电平的影响与以前发表的结果相似。特别是，过冲在4.0比在1.0 kHz，和过冲在4.0 kHz往往会随着掩蔽电平的增加而减少。在4.0 kHz时，正常耳中的过冲值明显更大：正常耳中的最大值范围约为7-26 dB，但受损耳中的最大值始终小于5 dB。较小的过冲值导致的事实，即在短延迟条件下的阈值是相当好的听力受损的科目比正常听力科目。在1.0 kHz时，两组受试者的过冲值或多或少重叠。结果表明，永久性的感音神经性听力损失破坏了导致大的超调效应的机制。
Overshoot was measured in both ears of four subjects with normal hearing and in five subjects with permanent, sensorineural hearing loss (two with a unilateral loss). The masker was a 400-ms broadband noise presented at a spectrum level of 20, 30, or 40 dB SPL. The signal was a 10-ms sinusoid presented 1 or 195 ms after the onset of the masker. Signal frequency was 1.0 or 4.0 kHz, which placed the signal in a region of normal (1.0 kHz) or impaired (4.0 kHz) absolute sensitivity for the impaired ears. For the normal-hearing subjects, the effects of signal frequency and masker level were similar to those published previously. In particular, overshoot was larger at 4.0 than at 1.0 kHz, and overshoot at 4.0 kHz tended to decrease with increasing masker level. At 4.0 kHz, overshoot values were significantly larger in the normal ears: Maximum values ranged from about 7-26 dB in the normal ears, but were always less than 5 dB in the impaired ears. The smaller overshoot values resulted from the fact that thresholds in the short-delay condition were considerably better in the hearing-impaired subjects than in the normal-hearing subjects. At 1.0 kHz, overshoot values for the two groups of subjects more or less overlapped. The results suggest that permanent, sensorineural hearing loss disrupts the mechanisms responsible for a large overshoot effect.