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08:05
Testing Tactile Masking between the Forearms
Published on: February 10, 2016
Masking release for sweeping masker components with correlated envelopes
Jesko L Verhey1, Hendrike Klein-Hennig, Bastian Epp
1Department of Experimental Audiology, Otto von Guericke University Magdeburg, Leipziger Str. 44, 31920, Magdeburg, Germany. jesko.verhey@med.ovgu.de
Journal of the Association for Research in Otolaryngology : JARO
|October 12, 2012
Summary
The auditory system uses sound properties to separate sources. This study found that comodulation masking release (CMR) occurs even with frequency sweeps, but not with spectro-temporal modulations, suggesting temporal modulation filters are key.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal processing
Background:
- The auditory system separates sound sources using properties like temporal envelope fluctuations and frequency correlations.
- Comodulation masking release (CMR) improves signal detection with comodulated maskers compared to uncorrelated ones.
Purpose of the Study:
- Investigate auditory processing of combined temporal and spectral cues in sound source separation.
- Examine the role of spectro-temporal modulation filters in CMR.
Main Methods:
- Utilized a generalized comodulation masking release (CMR) paradigm with a flanking-band setup.
- Tested CMR with coherent frequency sweeps of signal and masker up to 6 octaves/sec.
- Investigated CMR with spectro-temporal masker modulations using time-shifted envelopes.
Main Results:
- CMR was observed for maskers and signals with coherent frequency sweeps.
- Thresholds increased when temporal coherence shifted to spectro-temporal masker modulation.
- Evidence suggests spectro-temporal modulation filters are not essential for CMR.
Conclusions:
- The auditory system effectively uses coherent frequency sweeps for sound separation.
- CMR relies on temporal modulation processing rather than spectro-temporal modulation filters.
- Findings inform models of auditory scene analysis and sound perception.
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