Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow 119071, Russia.
J Acoust Soc Am. 2019 Oct;146(4):2231. doi: 10.1121/1.5127835.
The resolution of spectral ripples is a useful test for the spectral resolution of hearing. However, the use of different measurement paradigms might yield diverging results because of a paradigm-dependent contribution of excitation-pattern and temporal-processing mechanisms. In the present study, ripple-density resolution was measured in normal-hearing listeners for several frequency bands (centered at 0.5, 1, 2, and 4 kHz), using two paradigms: (i) discrimination of a rippled-spectrum test signal from a rippled reference signal differing by the ripple phase pattern, and (ii) discrimination of a rippled-spectrum test signal from a nonrippled reference signal. For the rippled reference signals, the resolution slightly depended on signal frequency. For the nonrippled reference signals, the resolution depended on the signal frequency; it varied from 8.8 ripples/oct at 0.5 kHz to 34.2 ripples/oct at 4 kHz. Excitation-pattern and temporal-processing models of spectral analysis were considered. Predictions of the excitation-pattern model agreed with the data obtained with the rippled reference signals. In contrast, predictions of the temporal-processing model agreed with the data obtained with the nonrippled reference signals. Thus, depending on the used reference signal type, the ripple-density resolution estimates characterize the discrimination abilities of the corresponding mechanisms.
声纹分辨率是测试听觉频谱分辨率的有效方法。然而，由于激励模式和时程处理机制的依赖性贡献，不同的测量范式可能会产生不同的结果。在本研究中，我们使用两种范式（i）从具有不同声纹相位模式的声纹参考信号中区分测试信号，和（ii）从非声纹参考信号中区分测试信号，测量了正常听力受试者在几个频率带（中心频率为 0.5、1、2 和 4 kHz）中的声纹密度分辨率。对于声纹参考信号，分辨率略取决于信号频率。对于非声纹参考信号，分辨率取决于信号频率；在 0.5 kHz 时为 8.8 个声纹/oct，在 4 kHz 时为 34.2 个声纹/oct。我们考虑了频谱分析的激励模式和时程处理模型。激励模式模型的预测与使用声纹参考信号获得的数据相符。相比之下，时程处理模型的预测与使用非声纹参考信号获得的数据相符。因此，根据所使用的参考信号类型，声纹密度分辨率估计值可描述相应机制的辨别能力。
