A third-person perspective on co-speech action gestures in Parkinson's disease
A third-person perspective on co-speech action gestures in Parkinson's disease
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DOI：
10.1016/j.cortex.2016.02.009
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发表时间：
2016-05-01
期刊：
影响因子：
3.6
通讯作者：
Polialzoff, Ellen
中科院分区：
文献类型：
--
作者：
Humphries, Stacey;Holler, Judith;Polialzoff, Ellen
帕金森病 (PD) 的运动和认知功能受损会影响语言和交流，患者在处理动作动词时表现出特别困难。共同言语手势体现了行动和语言之间的联系，对健康人的沟通做出了重大贡献。在这里，我们研究了描述动作的共同语音手势在 PD 中如何受到影响，特别是在它们所描述的视觉视角或观点方面。手势与心理意象和运动模拟密切相关，但患有帕金森病的人从第一人称视角模拟动作的方式可能会受到损害，并且可能会通过更多地依赖第三人称视觉特征来弥补这一点。我们分析了轻中度帕金森病患者和年龄匹配的对照组在动作描述任务中产生的动作描述手势，并检查了手势观点、动作命名和动作观察任务（体重判断）表现之间的关系。健康对照者从第一人称视角产生大部分动作手势，而帕金森病患者则从第三人称视角产生更大比例的动作手势。我们认为这反映了在 PD 动作模拟中对第三人称视觉特征的补偿性依赖。动作命名和重量判断方面的表现也受到损害，尽管这与手势视点无关。我们的研究结果提供了对PD中动作语言障碍如何影响动作沟通、这种障碍的认知基础的更全面的理解，并阐明了动作模拟在手势产生中的作用。 (C) 2016 年作者。由爱思唯尔有限公司出版
A combination of impaired motor and cognitive function in Parkinson's disease (PD) can impact on language and communication, with patients exhibiting a particular difficulty processing action verbs. Co-speech gestures embody a link between action and language and contribute significantly to communication in healthy people. Here, we investigated how co-speech gestures depicting actions are affected in PD, in particular with respect to the visual perspective-or the viewpoint - they depict. Gestures are closely related to mental imagery and motor simulations, but people with PD may be impaired in the way they simulate actions from a first-person perspective and may compensate for this by relying more on third-person visual features. We analysed the action-depicting gestures produced by mild-moderate PD patients and age-matched controls on an action description task and examined the relationship between gesture viewpoint, action naming, and performance on an action observation task (weight judgement). Healthy controls produced the majority of their action gestures from a first-person perspective, whereas PD patients produced a greater proportion of gestures produced from a third-person perspective. We propose that this reflects a compensatory reliance on third-person visual features in the simulation of actions in PD. Performance was also impaired in action naming and weight judgement, although this was unrelated to gesture viewpoint. Our findings provide a more comprehensive understanding of how action-language impairments in PD impact on action communication, on the cognitive underpinnings of this impairment, as well as elucidating the role of action simulation in gesture production. (C) 2016 The Authors. Published by Elsevier Ltd.