Tactile Gap Detection Deteriorates during Bimanual Symmetrical Movements under Mirror Visual Feedback.
Tactile Gap Detection Deteriorates during Bimanual Symmetrical Movements under Mirror Visual Feedback.
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DOI：
10.1371/journal.pone.0146077
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Spence C
中科院分区：
文献类型：
--
作者：
Bultitude JH;Juravle G;Spence C
运动意图信号和感觉输入信号之间的不一致可能导致疼痛和其他感觉异常。这一说法得到了以下报告的支持：在诱导感觉运动冲突的环境中移动会导致某些疼痛状况的疼痛和感觉症状加剧。类似的程序也会导致健康志愿者出现异常感觉。在本研究中，我们使用镜像视觉反馈来调查的影响，感觉运动不一致的反应，从身体外部的来源，特别是触摸产生的刺激。右臂的感觉和运动信号之间的不一致性是通过让参与者做对称或不对称的运动来操纵的，同时观察他们左臂在一面反光镜中的反射，或者一个类似位置的不透明板的左手表面。与我们的预测相反，当参与者在镜像视觉反馈期间进行不对称运动时，与没有视觉反馈时进行对称或不对称运动相比，对右前臂触觉刺激中存在间隙的敏感性并没有降低。相反，当参与者在镜像视觉反馈期间相对于其他三种条件进行对称运动时，敏感性降低。我们认为，感觉和运动信息之间的小差异，因为它们发生在镜像视觉反馈与对称运动，可以损害触觉处理。相反，不对称运动与镜像视觉反馈可能不会影响触觉处理，因为感觉和运动信息之间的较大差异可能会阻止这些信息源的整合。这些结果与以前的报告相比，异常的感觉在暴露于低和高的感觉运动冲突，但尽管如此，在目标导向运动的知觉调制的前向模型解释是一致的。
It has been suggested that incongruence between signals for motor intention and sensory input can cause pain and other sensory abnormalities. This claim is supported by reports that moving in an environment of induced sensorimotor conflict leads to elevated pain and sensory symptoms in those with certain painful conditions. Similar procedures can lead to reports of anomalous sensations in healthy volunteers too. In the present study, we used mirror visual feedback to investigate the effects of sensorimotor incongruence on responses to stimuli that arise from sources external to the body, in particular, touch. Incongruence between the sensory and motor signals for the right arm was manipulated by having the participants make symmetrical or asymmetrical movements while watching a reflection of their left arm in a parasagittal mirror, or the left hand surface of a similarly positioned opaque board. In contrast to our prediction, sensitivity to the presence of gaps in tactile stimulation of the right forearm was not reduced when participants made asymmetrical movements during mirror visual feedback, as compared to when they made symmetrical or asymmetrical movements with no visual feedback. Instead, sensitivity was reduced when participants made symmetrical movements during mirror visual feedback relative to the other three conditions. We suggest that small discrepancies between sensory and motor information, as they occur during mirror visual feedback with symmetrical movements, can impair tactile processing. In contrast, asymmetrical movements with mirror visual feedback may not impact tactile processing because the larger discrepancies between sensory and motor information may prevent the integration of these sources of information. These results contrast with previous reports of anomalous sensations during exposure to both low and high sensorimotor conflict, but are nevertheless in agreement with a forward model interpretation of perceptual modulations during goal directed movement.