Modeling within- and across-channel processes in comodulation masking release.

Torsten Dau, Tobias Piechowiak, Stephan D Ewert

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The relative contributions of within-channel and across-channel processes to perceptual comodulation masking release (CMR) were investigated in the framework of an auditory processing model. A generalized version of the computational auditory signal processing and perception model [CASP; Jepsen et al., J. Acoust. Soc. Am. 124, 422-438 (2008)] was used and extended by an across-channel modulation processing stage according to Piechowiak et al. [J. Acoust. Soc. Am. 121, 2111-2126 (2007)]. Five experimental paradigms were considered: CMR with a broadband noise masker as a function of the masker spectrum level; CMR with four widely spaced flanking bands (FBs) varying in overall level; CMR with one FB varying in frequency and level relative to the on-frequency band (OFB); CMR with one FB varying in frequency; and CMR as a function of the number of FBs. The predictions suggest that at least three different mechanisms contribute to overall CMR in the considered conditions: (1) a within-channel process based on changes in the envelope characteristic due to the addition of the signal to the masker; (2) a within-channel process based on nonlinear peripheral processing of the OFB's envelope caused by the FB(s); and (3) an across-channel process that is robust across presentation levels but relatively small (2-5 dB).
Original languageEnglish
JournalAcoustical Society of America. Journal
Volume133
Issue number1
Pages (from-to)350-364
ISSN0001-4966
DOIs
Publication statusPublished - 2013

Keywords

  • Acoustic noise
  • Hearing
  • Neurophysiology

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