Biases in rhythmic sensorimotor coordination: Effects of modality and intentionality
Biases in rhythmic sensorimotor coordination: Effects of modality and intentionality
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DOI：
10.1016/j.bbr.2013.05.005
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发表时间：
2013-08-01
影响因子：
2.7
通讯作者：
Peper, C. (Lieke) E.
中科院分区：
文献类型：
--
作者：
Debats, Nienke B.;Ridderikhoff, Arne;Peper, C. (Lieke) E.
对有意的(跟踪任务)和无意的(分心任务)节奏协调的感觉运动偏差进行了检查。跟踪任务包括单手跟踪振荡的视觉信号或对侧手的被动运动(本体感觉信号)。在这两种情况下，所需的协调模式(等向和镜像对称)都是相对于身体中线定义的，手是看不见的。对于本体感觉跟踪，两种模式的稳定性没有差异，而对于视觉跟踪，等向模式比镜像对称模式执行得更稳定。然而，当在视觉跟踪过程中提供关于单手运动的视觉反馈时，等向模式不再占主导地位。总之，这些结果表明，协调模式的稳定性并不取决于目标信号本身的通道，而是取决于需要处理的感觉信号的组合(单通道与跨通道)。分心任务需要有节奏的单手动作，在此过程中，必须忽略有节奏的视觉或本体感觉分心信号。观察到的偏差与意向性协调相似，表明意向性不会定性地影响潜在的感觉运动过程。意向性跟踪的特点是通过被动运动手臂的肌肉活动(本体感觉跟踪任务)和有节奏的眼球运动(视觉跟踪任务)进行主动感觉追求。据推测，这一努力为协调进程提供了预测性信息。(C)2013爱思唯尔B.V.保留所有权利。
Sensorimotor biases were examined for intentional (tracking task) and unintentional (distractor task) rhythmic coordination. The tracking task involved unimanual tracking of either an oscillating visual signal or the passive movements of the contralateral hand (proprioceptive signal). In both conditions the required coordination patterns (isodirectional and mirror-symmetric) were defined relative to the body midline and the hands were not visible. For proprioceptive tracking the two patterns did not differ in stability, whereas for visual tracking the isodirectional pattern was performed more stably than the mirror-symmetric pattern. However, when visual feedback about the unimanual hand movements was provided during visual tracking, the isodirectional pattern ceased to be dominant. Together these results indicated that the stability of the coordination patterns did not depend on the modality of the target signal per se, but on the combination of sensory signals that needed to be processed (unimodal vs. cross-modal). The distractor task entailed rhythmic unimanual movements during which a rhythmic visual or proprioceptive distractor signal had to be ignored. The observed biases were similar as for intentional coordination, suggesting that intentionality did not affect the underlying sensorimotor processes qualitatively. Intentional tracking was characterized by active sensory pursuit, through muscle activity in the passively moved arm (proprioceptive tracking task) and rhythmic eye movements (visual tracking task). Presumably this pursuit afforded predictive information serving the coordination process. (C) 2013 Elsevier B.V. All rights reserved.