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Masahiko Higashikawa

Publications and source records attributed to Masahiko Higashikawa.

3 recordsLinked to original sources
PubMed2006

[Fluorogram using digital X-ray cineradiography].

We discussed the usefulness of fluorogram obtained using digital X-ray cineradiography (digital-cine-fluorograpy) in the diagnosis of dysphagia, comparied with that of video-fluorograpy. Digital-cine-fluorograpy produces five frames per second. A qualitative evaluation comfirmed that five frames per second was sufficient to grasp movement during swallowing in clinical setting. Digital-cine-fluorograpy imaging was also convenient for clinical practice in that the medical records can be accessed from any workstation. Although the maximum photography time (around 10 seconds) is limited and a higher exposure dose is required, we concluded that digital-cine-fluorograpy is a useful tool for the diagnosis of dysphagia.

Cineradiography↗
PubMedDate not supplied

Lip kinematics for /p/ and /b/ production during whispered and voiced speech.

In the absence of voicing, the discrimination of "voiced" and "voiceless" stop consonants in whispered speech relies on such acoustic cues as burst duration and amplitude, and formant transition characteristics. The articulatory processes that generate these features of whispered speech remain speculative. This preliminary investigation examines the articulatory kinematics differences between whispered /p/ and /b/, which may underlie the acoustic differences previously reported for these sounds. Computerized video-tracking methods were used to evaluate kinematic differences between voiced and voiceless stops. Seven subjects produced the target utterances "my papa puppy" and "my baba puppy" in voiced and whispered speech modes. The results revealed that mean peak opening and closing velocities for /b/ were significantly greater than those for /p/ during whispered speech. No differences in peak velocity for either oral closing or opening were observed during voiced speech. The maximum distance between the lips for oral opening for /b/ was significantly greater than for /p/ during whisper, whereas no difference was observed during voiced speech. These data supported the suggestion that whispered speech and voiced speech rely on distinct motor control processes.

Adult↗