title: Physiological evidence for auditory modulation filterbanks: cortical responses to concurrent modulations.
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.
authors.affiliation: Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20815, USA. juanjuan.xiang@gs.com
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Xiang
authors.forename: David
authors.initials: D
authors.lastname: Poeppel
authors.forename: Jonathan Z
authors.initials: JZ
authors.lastname: Simon
mesh_terms: D000161:Acoustic Stimulation; D001303:Auditory Cortex / Q000502:physiology*; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D017711:Nonlinear Dynamics; D010700:Phonetics; D011571:Psychoacoustics; D013061:Speech Acoustics; D013065:Speech Intelligibility; D013067:Speech Perception; D013997:Time Factors; D055815:Young Adult