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

Anu Sharma, Michael Dorman

    Research output: Contribution to journalArticle

    131 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

    @article{71520f38b25a466f9d3903f6df6783be,
    title = "Cortical auditory evoked potential correlates of categorical perception of voice-onset time",
    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.",
    author = "Anu Sharma and Michael Dorman",
    year = "1999",
    doi = "10.1121/1.428048",
    language = "English (US)",
    volume = "106",
    pages = "1078--1083",
    journal = "Journal of the Acoustical Society of America",
    issn = "0001-4966",
    publisher = "Acoustical Society of America",
    number = "2",

    }

    TY - JOUR

    T1 - Cortical auditory evoked potential correlates of categorical perception of voice-onset time

    AU - Sharma, Anu

    AU - Dorman, Michael

    PY - 1999

    Y1 - 1999

    N2 - 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.

    AB - 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.

    UR - http://www.scopus.com/inward/record.url?scp=0032800227&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0032800227&partnerID=8YFLogxK

    U2 - 10.1121/1.428048

    DO - 10.1121/1.428048

    M3 - Article

    C2 - 10462812

    AN - SCOPUS:0032800227

    VL - 106

    SP - 1078

    EP - 1083

    JO - Journal of the Acoustical Society of America

    JF - Journal of the Acoustical Society of America

    SN - 0001-4966

    IS - 2

    ER -