著者

安藤 瑠称 吉岡 実穂 大門 正太郎 板口 典弘

出版者

日本基礎心理学会

雑誌

基礎心理学研究 (ISSN:02877651)

巻号頁・発行日

pp.psychono.42.4, (Released:2023-11-28)

参考文献数

56

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Healthy participants can adaptively modulate their trajectory height to reduce possible disturbance to the movement when signal dependent noises increase. We aimed to clarify whether such an adaptive trajectory planning ability is preserved in hemiplegia patients, who showed decreased motor skills because of brain injury, and analyzed reaching kinematics with or without a 200 g weight. We hypothesized that patients would adjust their trajectory in simple reaching movements to compensate the lack of motor control accuracy due to their symptoms. The results show that patients’ trajectories with a weight were higher than those without a weight in affected hands. Moreover, in the 200 g weight condition, even higher trajectory was observed in the second block compared to the first block. These results suggest that hemiplegia patients can plan an adaptive trajectory, considering their movement accuracy, task requirements, and increased effects of motor noises due to muscle fatigue. We also replicated the results of the previous study using healthy participants, which are explained by the same mechanism considering motor noises and task requirements.

著者

吐師 道子 小玉 明菜 三浦 貴生 大門 正太郎 高倉 祐樹 林 良子

出版者

日本音声学会

雑誌

音声研究 (ISSN:13428675)

巻号頁・発行日

vol.18, no.2, pp.95-105, 2014-08-30 (Released:2017-08-31)

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The place of articulation in Japanese moraic-nasals is known to vary in accordance with the following sound and is assumed to be uvular in the word final position. This paper attempted to describe articulatory variability of word-final moraic-nasals using the X-ray microbeam speech production database in Japanese. The results depicted substantive inter-speaker variability in three of the four words examined. Moreover, 75% of the data examined were deemed unlikely to be uvular nasals and the lips were likely to be closed in 40% of the data. The results do not support the claim that word-final moraic-nasals are uvular.