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.
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March 2017
March 20 2017
Characteristics of spectro-temporal modulation frequency selectivity in humans
Arne Oetjen;
Arne Oetjen
a)
Acoustics group,
Carl von Ossietzky University Oldenburg
, Carl von Ossietzky Strasse 9-11, 26129 Oldenburg, Germany
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Jesko L. Verhey
Jesko L. Verhey
Department of Experimental Audiology,
Otto von Guericke University Magdeburg
, 39120 Magdeburg, Germany
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a)
Electronic mail: [email protected]
J. Acoust. Soc. Am. 141, 1887–1895 (2017)
Article history
Received:
May 03 2016
Accepted:
February 01 2017
Citation
Arne Oetjen, Jesko L. Verhey; Characteristics of spectro-temporal modulation frequency selectivity in humans. J. Acoust. Soc. Am. 1 March 2017; 141 (3): 1887–1895. https://doi.org/10.1121/1.4976537
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