Carney A E, Nelson D A
J Acoust Soc Am. 1983 Jan;73(1):268-78. doi: 10.1121/1.388860.
Simultaneous psychophysical tuning curves were obtained from normal-hearing and hearing-impaired listeners, using probe tones that were either at similar sound pressure levels or at similar sensation levels for the two types of listeners. Tuning curves from the hearing-impaired listeners were flat, erratic, broad, and/or inverted, depending upon the frequency region of the probe tone and the frequency characteristics of the hearing loss. Tuning curves from the normal-hearing listeners at low-SPL's were sharp as expected; tuning curves at high-SPL's were discontinuous. An analysis of high-SPL tuning curves suggests that tuning curves from normal-hearing listeners reflect low-pass filter characteristics instead of the sharp bandpass filter characteristics seen with low-SPL probe tones. Tuning curves from hearing-impaired listeners at high-SPL probe levels appear to reflect similar low-pass filter characteristics, but with much more gradual high-frequency slopes than in the normal ear. This appeared as abnormal downward spread of masking. Relatively good temporal resolution and broader tuning mechanisms were proposed to explain inverted tuning curves in the hearing-impaired listeners.
通过使用对两类听众而言声压水平相似或感觉水平相似的探测音，从听力正常和听力受损的听众那里获得了同步心理物理调谐曲线。听力受损听众的调谐曲线是平坦的、不稳定的、宽泛的和/或倒置的，这取决于探测音的频率区域和听力损失的频率特征。听力正常听众在低声压水平下的调谐曲线如预期那样尖锐；在高声压水平下的调谐曲线是不连续的。对高声压调谐曲线的分析表明，听力正常听众的调谐曲线反映的是低通滤波器特性，而非低声压探测音时呈现的尖锐带通滤波器特性。听力受损听众在高声压探测水平下的调谐曲线似乎反映了类似的低通滤波器特性，但高频斜率比正常耳朵中的更为平缓。这表现为异常的掩蔽向下扩展。人们提出了相对较好的时间分辨率和更宽泛的调谐机制来解释听力受损听众中的倒置调谐曲线。
