Bacon S P, Viemeister N F
Audiology. 1985;24(2):117-34. doi: 10.3109/00206098509081545.
Modulation thresholds for sinusoidally amplitude-modulated broadband noise were obtained from normal-hearing and sensorineural hearing-impaired listeners as a function of modulation frequency. The resulting temporal modulation transfer functions (TMTFs) indicated that the impaired listeners were generally less sensitive than the normals to amplitude modulation and, unlike previously published data from normal-hearing listeners, TMTFs in the impaired listeners were level dependent: sensitivity to modulation, particularly for modulation frequencies greater than 100 Hz, decreased with decreases in level. TMTFs were also obtained with band-limited noise from the normal-hearing listeners: the noise was low-pass filtered at 1.6 kHz after modulation and was generally presented with a 1.6-kHz high-pass masker. The TMTFs in the low-pass condition were similar to the TMTFs obtained with broadband noise from the impaired listeners, suggesting that the impaired temporal processing in the hearing-impaired listeners is a result of a narrower effective, 'internal' bandwidth. Increment thresholds for continuous broadband and low-pass noise were obtained in conditions similar to those in which TMTFs were obtained. In general, a similar power-law relationship between modulation threshold and increment threshold was found to exist for both the normal-hearing and the hearing-impaired listeners.
以调制频率为函数，从听力正常和感音神经性听力受损的听众那里获取了正弦幅度调制宽带噪声的调制阈值。所得的时间调制传递函数（TMTF）表明，与听力正常的听众相比，听力受损的听众对幅度调制的敏感度通常较低，并且与先前公布的听力正常听众的数据不同，听力受损听众的TMTF与声级有关：对调制的敏感度，尤其是对于大于100 Hz的调制频率，会随着声级的降低而降低。还从听力正常的听众那里获取了带限噪声的TMTF：调制后的噪声在1.6 kHz处进行低通滤波，并且通常与1.6 kHz的高通掩蔽音一起呈现。低通条件下的TMTF与从听力受损听众那里获取的宽带噪声的TMTF相似，这表明听力受损听众中受损的时间处理是有效“内部”带宽变窄的结果。在与获取TMTF相似的条件下，获得了连续宽带和低通噪声的增量阈值。一般来说，听力正常和听力受损的听众在调制阈值和增量阈值之间都存在类似的幂律关系。
