Oetjen Arne, Verhey Jesko L
Acoustics group, Carl von Ossietzky University Oldenburg, Carl von Ossietzky Strasse 9-11, 26129 Oldenburg, Germany.
Department of Experimental Audiology, Otto von Guericke University Magdeburg, 39120 Magdeburg, Germany.
J Acoust Soc Am. 2017 Mar;141(3):1887. doi: 10.1121/1.4976537.
There is increasing evidence that the auditory system shows frequency selectivity for spectro-temporal modulations. A recent study of the authors has shown spectro-temporal modulation masking patterns that were in agreement with the hypothesis of spectro-temporal modulation filters in the human auditory system [Oetjen and Verhey (2015). J. Acoust. Soc. Am. 137(2), 714-723]. In the present study, that experimental data and additional data were used to model this spectro-temporal frequency selectivity. The additional data were collected to investigate to what extent the spectro-temporal modulation-frequency selectivity results from a combination of a purely temporal amplitude-modulation filter and a purely spectral amplitude-modulation filter. In contrast to the previous study, thresholds were measured for masker and target modulations with opposite directions, i.e., an upward pointing target modulation and a downward pointing masker modulation. The comparison of this data set with previous corresponding data with the same direction from target and masker modulations indicate that a specific spectro-temporal modulation filter is required to simulate all aspects of spectro-temporal modulation frequency selectivity. A model using a modified Gabor filter with a purely temporal and a purely spectral filter predicts the spectro-temporal modulation masking data.
越来越多的证据表明，听觉系统对频谱-时间调制表现出频率选择性。作者最近的一项研究表明，频谱-时间调制掩蔽模式与人类听觉系统中频谱-时间调制滤波器的假设一致[Oetjen和Verhey（2015年）。《美国声学学会杂志》137(2)，714 - 723]。在本研究中，利用该实验数据和其他数据对这种频谱-时间频率选择性进行建模。收集其他数据是为了研究频谱-时间调制频率选择性在多大程度上是由纯时间幅度调制滤波器和纯频谱幅度调制滤波器的组合产生的。与之前的研究不同，测量了掩蔽器和目标调制方向相反时的阈值，即向上指向的目标调制和向下指向的掩蔽器调制。将该数据集与之前目标和掩蔽器调制方向相同的相应数据进行比较表明，需要一个特定的频谱-时间调制滤波器来模拟频谱-时间调制频率选择性的所有方面。一个使用具有纯时间和纯频谱滤波器的修改后的伽柏滤波器的模型预测了频谱-时间调制掩蔽数据。
