Bodywide fluctuations support manual exploration: Fractal fluctuations in posture predict perception of heaviness and length via effortful touch by the hand
Bodywide fluctuations support manual exploration: Fractal fluctuations in posture predict perception of heaviness and length via effortful touch by the hand
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DOI：
10.1016/j.humov.2019.102543
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发表时间：
2020-02-01
影响因子：
2.1
通讯作者：
Kelty-Stephen, Damian G.
中科院分区：
文献类型：
--
作者：
Mangalam, Madhur;Chen, Ryan;Kelty-Stephen, Damian G.
人类触觉感知系统尊重全身组织，通过多个非重叠尺度上嵌套的张力和压缩的全身协调来响应局部刺激。在这样的组织下，手动提升物体以感知其重量和长度的超姿势任务应该依赖于延伸到姿势控制中的根，以保持地面上的直立平衡。因此，整个身体的姿势摆动应该带有预测手通过举起物体可以提取什么的信号。我们发现，分形波动的欧几里得位移在参与者的压力中心（CoP）有助于知觉判断，调节参与者的手如何拿起转动惯量的信息变量。分形在CoP位移中的作用在支持沉重和长度判断方面在试验中有所增加，这表明参与者在他们对沉重和长度的感知中逐渐涉及他们的分形尺度。传统上，我们必须测量手部动作的分形性，以通过手动加权来预测感知判断。然而，我们的研究结果表明，我们可以观察到手头上发生的事情，在相对远离手头的措施。我们的研究结果揭示了复杂的关系，通过姿势支持手动探索，需要感知的预期性质的重物（重量或长度）pupelies通过重新分配的力量在整个身体。
The human haptic perceptual system respects a bodywide organization that responds to local stimulation through full-bodied coordination of nested tensions and compressions across multiple nonoverlapping scales. Under such an organization, the suprapostural task of manually hefting objects to perceive their heaviness and length should depend on roots extending into the postural control for maintaining upright balance on the ground surface. Postural sway of the whole body should thus carry signatures predicting what the hand can extract by hefting an object. We found that fractal fluctuations in Euclidean displacement in the participants' center of pressure (CoP) contributed to perceptual judgments by moderating how the participants' hand picked up the informational variable of the moment of inertia. The role of fractality in CoP displacement in supporting heaviness and length judgments increased across trials, indicating that the participants progressively implicate their fractal scaling in their perception of heaviness and length. Traditionally, we had to measure fractality in hand movements to predict perceptual judgments by manual hefting. However, our findings suggest that we can observe what is happening at hand in the relatively distant-from-hand measure of CoP. Our findings reveal the complex relationship through which posture supports manual exploration, entailing perception of the intended properties of hefted objects (heaviness or length) putatively through the redistribution of forces throughout the body.