Spatial resolution of visual feedback affects variability and structure of isometric force
Spatial resolution of visual feedback affects variability and structure of isometric force
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DOI：
10.1016/j.neulet.2009.12.068
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发表时间：
2010-02-12
影响因子：
2.5
通讯作者：
Riley, Michael A.
中科院分区：
文献类型：
--
作者：
Kuznetsov, Nikita A.;Riley, Michael A.
本研究旨在探讨视觉反馈的空间分辨率对等长力的变异性和结构的影响。我们通过改变可能的反馈点位置的数量来操纵显示器的空间分辨率。12名健康的年轻人（5名男性，7名女性）试图使用两种类型的视觉显示器，用食指向测压元件施加恒定水平的力。一个显示器通过允许反馈点从沿着屏幕的垂直维度的440个像素中取任何位置来提供高空间分辨率视觉反馈。该显示器提供了关于相对于目标的当前力水平以及目标周围的允许力偏差范围的精确信息。另一个显示器提供了低空间分辨率的视觉反馈，通过将施加的力描绘为仅取三个离散值-低于、在目标范围内或高于目标范围。参与者产生较少的变量和更复杂的（更高的近似熵）力输出与显示器，具有更高的空间分辨率。力的时间序列的递归量化分析表明，低视觉反馈分辨率的显示器促进了更间歇性，不连续的力生产性能。出版社：Elsevier爱尔兰有限公司
The purpose of this study was to examine the effect of spatial resolution of visual feedback on the variability and structure of isometric force. We manipulated spatial resolution of the display by changing the number of possible feedback dot positions. Twelve healthy young adults (5 men, 7 women) attempted to apply a constant level of force normal to a load cell with the index finger using two types of visual displays. One display provided high spatial resolution visual feedback by allowing feedback dot take any position from the 440 pixels along the vertical dimension of the screen. This display provided precise information about the current level of force relative to the target and to a range of allowable force deviation around the target. The other display provided low spatial resolution visual feedback by depicting applied force as taking on only three discrete values-below, within, or above the target range. Participants produced less variable and more complex (higher approximate entropy) force output with the displays that had higher spatial resolution. Recurrence quantification analysis of the force time series revealed that the display with low visual feedback resolution promoted a more intermittent, discontinuous force-production performance. Published by Elsevier Ireland Ltd.