Prosodic disturbances in apraxic speech. Disturbance in duration.:Disturbance in Duration

概要

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The aim of the present study is to investigate the relationship between mora duration and utterance duration in a patient with pure apraxia of speech. A list of utterances ranging in length from one mora to nine morae was read by the patient (1) in isolation and (2) embedded in a carrier sentence. Individual mora durations as well as utterance durations were measured from speech envelopes, formant patterns obtained from PARCOR analysis and sound spectrograms. Major findings included the following: (1) utterance durations are quite long in both isolated and embedded conditions even when pauses are excluded from the measurement; (2) the mean of utterance durations increases proportionately to the number of morae contained, although individual utterance duration varies greatly from utterance to utterance; (3) the first mora duration decreases up to two-mora utterance both in isolated and in embedded conditions, but it rapidly increases above two-mora utterance, which is different from normal subjects; (4) durational disturbance of the initial segment is compensated by the duration of the following segment in embedded condition, but this is not the case in isolated condition; (5) pauses appear at grammatical item boundaries.Based upon these findings, characteristics of prosodic disturbances in apraxic speech were discussed.
日本音声言語医学会の論文