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On categorizing aphasic speech errors.

B Tuller

    Neuropsychologia
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Voice-onset-time (VOT) measures alone are insufficient for characterizing speech production in aphasia. Vowel duration analysis revealed that VOT findings did not reliably predict articulatory output in either fluent or nonfluent aphasic speakers.

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    Area of Science:

    • Speech-language pathology
    • Neurolinguistics
    • Phonetics

    Background:

    • Previous acoustic studies suggested distinct error origins in fluent versus nonfluent aphasia based on voice-onset-time (VOT).
    • Fluent aphasia errors were hypothesized as phonemic target selection issues, while nonfluent aphasia errors were attributed to articulatory deficits.
    • Caution is advised when generalizing aphasia characteristics from a single articulatory measure.

    Purpose of the Study:

    • To investigate whether voice-onset-time (VOT) findings in aphasic speech are supported by other acoustic measures.
    • To examine the relationship between VOT and preceding vowel duration as indicators of consonant voicing in fluent and nonfluent aphasia.
    • To determine if VOT can reliably characterize the broader articulatory output of aphasic speakers.

    Main Methods:

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    • Replication of previous voice-onset-time (VOT) measurements in five fluent aphasics, five nonfluent aphasics, and two controls.
    • Analysis of vowel duration preceding word-final stop consonants as an index of consonant voicing category.
    • Comparison of patterns observed in VOT data with patterns in vowel duration data.

    Main Results:

    • Voice-onset-time (VOT) findings were successfully replicated in the study cohort.
    • The pattern of voice-onset-times produced by the participants did not predict the observed patterns of vowel durations.
    • Vowel duration did not consistently align with the voicing category indicated by VOT measurements.

    Conclusions:

    • Voice-onset-time (VOT) alone is an inadequate measure for comprehensively characterizing the speech production abilities of aphasic individuals.
    • The articulatory output of aphasic speakers, as reflected by vowel duration, is not reliably predicted by VOT measures.
    • Further research employing multiple acoustic and articulatory measures is necessary for a more accurate understanding of aphasia speech patterns.