First International Conference on Spoken Language Processing (ICSLP 90)
Characteristics of articulatory movements and. pitch control were investigated in the realization of Japanese word accent for a patient with apraxia of speech. Japanese meaningful words beginning with [ai] which have an upward pitch transition at the end of the initial mora were uttered at normal (5.0 mora/s) and slow (3.3 mora/s) speaking rates by a patient with apraxia of speech and five normal controls. Formant trajectories for the initial vowel sequence and pitch contour were extracted and analyzed based on the models proposed by Fujisaki , The results for the patient indicated marked delay of pitch control relative to articulatory movements for the slow speaking rate, and shortening of duration of pitch transition in proportion to the delay of initiation of pitch control. A positive correlation of amplitude of accent command with duration of pitch transition was observed for both normal subjects and the patient with apraxia of speech. The correlation indicates compensatory control of amplitude of accent command in order to produce sufficient upward pitch shift against the gradual fall of the voicing component of pitch contour.
Bibliographic reference. Masaki, Shinobu / Tatsumi, Itaru F. / Sasanuma, Sumiko (1990): "Analysis of temporal coordination between articulatory movements and pitch control in the realization of Japanese word accent by a patient with apraxia of speech", In ICSLP-1990, 597-600.