title: Auditory evoked M100 reflects onset acoustics of speech sounds.
abstract: Magnetoencephalography (MEG) was used to investigate the response to speech sounds that differ in onset dynamics, parameterized as words that have initial stop consonants (e.g., /b/, /t/) or do not (e.g., /m/, /f/). Latency and amplitude of the M100 auditory evoked neuromagnetic field, recorded over right and left auditory cortices, varied as a function of onset: stops had shorter latencies and higher amplitudes than no-stops in both hemispheres, consistent with the hypothesis that M100 is a sensitive indicator of spectral properties of acoustic stimuli. Further, activation patterns in response to stops/no-stops differed in the two hemispheres, possibly reflecting differential perceptual processing for the acoustic-phonetic cues at the onset of spoken words.
authors.affiliation: Department of Cognitive Sciences, University of California, Irvine, CA 92697, USA.
authors.forename: N
authors.initials: N
authors.lastname: Gage
authors.forename: D
authors.initials: D
authors.lastname: Poeppel
authors.forename: T P
authors.initials: TP
authors.lastname: Roberts
authors.forename: G
authors.initials: G
authors.lastname: Hickok
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D011930:Reaction Time / Q000502:physiology*; D013061:Speech Acoustics