Does Viewing Mirror-Reflected Body Image Affect Static and Dynamic Standing Balance?

IF 1.4 4区 心理学 Q4 PSYCHOLOGY, EXPERIMENTAL
Perceptual and Motor Skills Pub Date : 2024-08-01 Epub Date: 2024-05-10 DOI:10.1177/00315125241253634
Naoki Hamada, Ryo Tsujinaka, Hitoshi Oda, Shiho Fukuda, Masakazu Matsuoka, Hiroshi Kunimura, Koichi Hiraoka
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Abstract

In the present study, we examined the immediate effect of allowing healthy participants to view their mirror-reflected body image on static and dynamic balance. We placed a mirror to allow participants to frontally view their own body image while maintaining a quiet stance or while engaged in a dynamic postural standing task. On measures of body sway during quiet stance, there were no effects of this visual feedback, supporting the view that human beings have no central mechanism for viewing the mirror-reflected body image to control body sway during quiet stance. However, the body deviated forward during quiet stance while viewing the mirror-reflected body image, indicating that viewing the mirror-reflected body image contributed to the anterior-posterior positioning of the body, as mediated by an ankle control strategy. For the dynamic standing task, viewing the body image induced unstable peaks of rhythmic lateral shifting of the body weight over the feet. This indicates that viewing the body image caused unstable motor commands for rhythmic lateral weight shifting. When participants made a transition from a bipedal to a unipedal stance in response to a cue, viewing the body image shortened the onset latency of the body sway. Accordingly, viewing the body image seemed to accelerate the motor execution involved in lateral weight shifting, possibly due to predictive activation of the motor system before movement onset. Considered collectively, we found static and dynamic stance balance to be influenced by viewing one's mirror-reflected body image. Viewing the mirror-reflected body image may be a means of changing static and dynamic balance in patients with impaired postural control.

观看镜子反射的身体形象会影响静态和动态站立平衡吗?
在本研究中,我们考察了让健康参与者观看镜像反射的身体形象对静态和动态平衡的直接影响。我们放置了一面镜子,让参与者在保持安静姿态或进行动态姿势站立任务时正面观看自己的身体影像。在测量安静站立时的身体摇摆时,这种视觉反馈没有任何影响,这支持了这样一种观点,即人类在观看镜子反射的身体影像时没有控制安静站立时身体摇摆的中心机制。然而,在观看镜面反射的身体影像时,身体在安静站立时会向前偏离,这表明观看镜面反射的身体影像有助于身体的前后定位,这是由踝关节控制策略介导的。在动态站立任务中,观察身体影像会引起身体重心有节奏地向脚部横向移动,并达到不稳定的峰值。这表明,观看身体图像会导致身体重心有节奏地横向移动的运动指令不稳定。当参与者根据提示从双足站立过渡到单足站立时,观看身体图像会缩短身体摇摆的开始潜伏期。因此,观看身体图像似乎加快了横向重心转移的运动执行速度,这可能是由于在运动开始前运动系统的预测性激活。综合来看,我们发现静态和动态的站立平衡都会受到观看镜像反射身体图像的影响。观看镜面反射体像可能是改变姿势控制受损患者静态和动态平衡的一种方法。
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来源期刊
Perceptual and Motor Skills
Perceptual and Motor Skills PSYCHOLOGY, EXPERIMENTAL-
CiteScore
2.90
自引率
6.20%
发文量
110
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