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J Acoust Soc Am. 2013 Jan;133(1):EL7-12. doi: 10.1121/1.4769400.

Physiological evidence for auditory modulation filterbanks: cortical responses to concurrent modulations.

Author information

1
Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20815, USA. juanjuan.xiang@gs.com

Abstract

Modern psychophysical models of auditory modulation processing suggest that concurrent auditory features with syllabic (~5 Hz) and phonemic rates (~20 Hz) are processed by different modulation filterbank elements, whereas features at similar modulation rates are processed together by a single element. The neurophysiology of concurrent modulation processing at speech-relevant rates is here investigated using magnetoencephalography. Results demonstrate expected neural responses to stimulus modulation frequencies; nonlinear interaction frequencies are also present, but, critically, only for nearby rates, analogous to "beating" in a cochlear filter. This provides direct physiological evidence for modulation filterbanks, allowing separate processing of concurrent syllabic and phonemic modulations.

PMID:
23298020
PMCID:
PMC3555506
DOI:
10.1121/1.4769400
[Indexed for MEDLINE]
Free PMC Article

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