Eddins D A
Department of Speech and Hearing Sciences, Indiana University, Bloomington 47405, USA.
J Acoust Soc Am. 1999 Feb;105(2 Pt 1):829-37. doi: 10.1121/1.426272.
Estimates of temporal acuity under comparable conditions at low- and high-audio frequencies are rare. The present study used the amplitude-modulation detection paradigm to estimate temporal acuity over a range of audio frequencies from 800 to 12,800 Hz. Amplitude-modulation detection was measured as a function of modulation frequency for bandlimited noise carriers, and the resulting temporal modulation-transfer functions were used to characterize temporal acuity. The most important result from the two experiments reported is that systematic manipulations of carrier upper-cutoff frequency produced estimates of temporal acuity that did not vary from 800 to 12,800 Hz. When the modulated noise bands were filtered after modulation to control for potential spectral cues, the low-pass cutoff of the modulation-transfer function varied with the carrier bandwidth. However, when the standard stimulus was a quasifrequency-modulated (QFM) noise and the signal was an unfiltered, amplitude-modulated noise, the low-pass cutoff of the modulation-transfer function was independent of carrier bandwidth. These results are consistent with a growing body of evidence demonstrating that auditory temporal acuity is constant throughout most of the audible frequency range.
在可比条件下对低频和高频音频的时间分辨力估计很少见。本研究使用调幅检测范式来估计800至12800赫兹范围内一系列音频频率的时间分辨力。调幅检测是作为带限噪声载波调制频率的函数进行测量的，所得的时间调制传递函数用于表征时间分辨力。所报告的两个实验的最重要结果是，对载波上截止频率的系统操纵产生的时间分辨力估计在800至12800赫兹之间没有变化。当调制后的噪声带在调制后进行滤波以控制潜在的频谱线索时，调制传递函数的低通截止频率随载波带宽而变化。然而，当标准刺激是准频率调制（QFM）噪声且信号是未滤波的调幅噪声时，调制传递函数的低通截止频率与载波带宽无关。这些结果与越来越多的证据一致，表明听觉时间分辨力在大部分可听频率范围内是恒定的。
