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Experimental Brain Research

Erschienen in:

01.12.2003 | Review

The psychophysics and physiology of comodulation masking release

verfasst von: Jesko L. Verhey, Daniel Pressnitzer, Ian M. Winter

Erschienen in: Experimental Brain Research | Ausgabe 4/2003

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Abstract

The ability to detect auditory signals from background noise may be enhanced by the addition of energy in frequency regions well removed from the frequency of the signal. However, it is important that this energy is amplitude-modulated in a coherent way across frequencies, i.e. comodulated. This enhancement of signal detectability is known as comodulation masking release (CMR), and in this review we show that CMR is largest if: (1) the total masker's bandwidth is large, (2) the modulation frequency is low, (3) the modulation depth is high, (4) the envelope is regular and, (5) the masker's spectrum level is high. Possible physiological correlates of CMR have been found at different levels of the auditory pathway. Current hypotheses for the underlying physiological mechanisms, including wide-band inhibition or the disruption of masker modulation envelope response, are discussed.

In contrast, Bacon et al. (1997) have obtained a CMR (UM-CM) that is considerably larger (on average approximately 7 dB) for a 2-kHz than for a 0.5-kHz tone-signal when compared at the same bandwidth in ERB. The reason for the different result obtained by Bacon et al. (1997) may be related to the difference in the modulator type. Haggard et al. (1990) and Verhey et al. (1999) used a low-pass noise modulator, whereas the CM masker used by Bacon et al. (1997) was a sinusoidally amplitude-modulated (SAM) noise.

Low-pass noise contains envelope frequencies in a range from zero to the cut-off frequency of the noise, with a mean rate approximately half the cut-off frequency. Multiplying the modulator with the carrier without direct-current shift effectively doubles the mean frequency. The mean modulation frequency for this low-pass modulator is approximately 1.12 times the cut-off frequency of low-pass noise (Verhey et al. 1999).

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Titel: The psychophysics and physiology of comodulation masking release
verfasst von: Jesko L. Verhey
Daniel Pressnitzer
Ian M. Winter
Publikationsdatum: 01.12.2003
Verlag: Springer-Verlag
Erschienen in: Experimental Brain Research / Ausgabe 4/2003
Print ISSN: 0014-4819
Elektronische ISSN: 1432-1106
DOI: https://doi.org/10.1007/s00221-003-1607-1

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