Cortical auditory evoked potential correlates of categorical perception of voice-onset time

Anu Sharma, Michael Dorman

Research output: Contribution to journalArticle

129 Citations (Scopus)

Abstract

The goal of this study was to examine the neural encoding of voice- onset time distinctions that indicate the phonetic categories /da/ and /ta/ for human listeners. Cortical Auditory Evoked Potentials (CAEP) were measured in conjunction with behavioral perception of a /da/-/ta/ continuum. Sixteen subjects participated in identification and discrimination experiments. A sharp category boundary was revealed between /da/ and /ta/ around the same location for all listeners. Subjects' discrimination of a VOT change of equal magnitude was significantly more accurate across the /da/-/ta/ categories than within the /ta/ category. Neurophysiologic correlates of VOT encoding were investigated using the N1 CAEP which reflects sensory encoding of stimulus features and the MMN CAEP which reflects sensory discrimination. The MMN elicited by the across-category pair was larger and more robust than the MMN which occurred in response to the within-category pair. Distinct changes in N1 morphology were related to VOT encoding. For stimuli that were behaviorally identified as /da/, a single negativity (N1) was apparent; however, for stimuli identified as /ta/, two distinct negativities (N1 and N1') were apparent. Thus the enhanced MMN responses and the morphological discontinuity in N1 morphology observed in the region of the /da/-/ta/ phonetic boundary appear to provide neurophysiologic correlates of categorical perception for VOT.

Original languageEnglish (US)
Pages (from-to)1078-1083
Number of pages6
JournalJournal of the Acoustical Society of America
Volume106
Issue number2
DOIs
StatePublished - 1999

Fingerprint

coding
stimuli
phonetics
sensory discrimination
discrimination
Evoked Potentials
Voice Onset Time
Categorical Perception
Hearing
discontinuity
continuums
Encoding
Stimulus
Discrimination
Listeners
Negativity

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Cortical auditory evoked potential correlates of categorical perception of voice-onset time. / Sharma, Anu; Dorman, Michael.

In: Journal of the Acoustical Society of America, Vol. 106, No. 2, 1999, p. 1078-1083.

Research output: Contribution to journalArticle

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