Recent studies suggest that an auditory nonlinearity converts second-order sinusoidal amplitude modulation (SAM) (i.e., modulation of SAM depth) into a first-order SAM component, which contributes to the perception of second-order SAM. However, conversion may also occur in other ways such as cochlear filtering. The present experiments explored the source of the first-order SAM component by investigating the ability to detect a 5-Hz, first-order SAM probe in the presence of a second-order SAM masker beating at the probe frequency. Detection performance was measured as a function of masker-carrier modulation frequency, phase relationship between the probe and masker modulator, and probe modulation depth. In experiment 1, the carrier was a 5-kHz sinusoid presented either alone or within a notched-noise masker in order to restrict off-frequency listening. In experiment 2, the carrier was a white noise. The data obtained in both carrier conditions are consistent with the existence of a modulation distortion component. However, the phase yielding poorest detection performance varied across experimental conditions between 0° and 180°, confirming that, in addition to nonlinear mechanisms, cochlear filtering and off-frequency listening play a role in second-order SAM perception. The estimated magnitude of the modulation distortion component ranges from 5%–12%.
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April 2005
April 08 2005
Modulation masking produced by second-order modulators
Christian Füllgrabe;
Christian Füllgrabe
Laboratoire de Psychologie Expérimentale—UMR CNRS 8581, Université René Descartes—Paris 5, 71 avenue Edouard Vaillant, 92774 Boulogne-Billancourt, France
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Brian C. J. Moore;
Brian C. J. Moore
Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, United Kingdom
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Laurent Demany;
Laurent Demany
Laboratoire de Neurophysiologie—UMR CNRS 5543, Université Victor Segalen—Bordeaux 2, France
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Stephan D. Ewert;
Stephan D. Ewert
Centre for Applied Hearing Research, Acoustic Technology, O/rsted—DTU, Technical University of Denmark, Denmark
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Stanley Sheft;
Stanley Sheft
Parmly Hearing Institute, Loyola University of Chicago, 6525 N. Sheridan Road, Chicago, Illinois 60626
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Christian Lorenzi
Christian Lorenzi
Institut Universitaire de France, Laboratoire de Psychologie Expérimentale—UMR CNRS 8581, Université René Descartes—Paris 5, France
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J. Acoust. Soc. Am. 117, 2158–2168 (2005)
Article history
Received:
February 13 2004
Accepted:
December 30 2004
Citation
Christian Füllgrabe, Brian C. J. Moore, Laurent Demany, Stephan D. Ewert, Stanley Sheft, Christian Lorenzi; Modulation masking produced by second-order modulators. J. Acoust. Soc. Am. 1 April 2005; 117 (4): 2158–2168. https://doi.org/10.1121/1.1861892
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