Laterally focused attention modulates asymmetric coupling in rhythmic interlimb coordination
Laterally focused attention modulates asymmetric coupling in rhythmic interlimb coordination
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DOI：
10.1007/s00426-006-0096-9
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发表时间：
2008-03-01
影响因子：
2.3
通讯作者：
Beek, Peter J.
中科院分区：
文献类型：
--
作者：
de Poel, Harjo J.;Peper, C. (Lieke) E.;Beek, Peter J.
Peters（J Motor Behav 21：151-155，1989; Interlimb coordination：neural，dynamic and cognitive constraints，Academic，Orlando，pp 595-615，1994）认为双手协调中的利手表现可能反映了固有的注意力偏差。事实上，以前的研究结果表明，将注意力集中在一个肢体上会影响肢体之间的相对相位，其方式与手优势的影响相当。本研究通过测试注意集中和利手对肢体间相互作用的影响，扩展了注意集中和利手效应之间的比较。左手和右手的参与者都进行有节奏的双手协调任务（同相和反相协调），同时将注意力集中在任何一个肢体上。使用简短的机械扰动，在何种程度上的肢体相互影响的确定。结果表明，非优势肢体更强烈地影响了优势肢体，反之亦然，并在彼得斯的主张，这利手相关的耦合强度的不对称性减少时，注意力集中在非优势肢体，从而突出了潜在的内在（利手相关）的不对称性和自愿注意力不对称性之间的关系。与以前的研究结果相反，当注意力集中在优势肢体上时，优势肢体的（通常观察到的）相位导联被衰减（而不是累积）。这个意想不到的结果可以用观察到的与注意力相关的肢体之间振幅差异来解释。
Peters (J Motor Behav 21:151-155, 1989; Interlimb coordination: neural, dynamical and cognitive constraints, Academic, Orlando, pp 595-615, 1994) suggested that expressions of handedness in bimanual coordination may be reflections of an inherent attentional bias. Indeed, previous results indicated that focusing attention on one of the limbs affected the relative phasing between the limbs in a manner comparable to the effects of hand dominance. The present study extended the comparison between the effects of attentional focus and handedness by testing their impact on the interactions between the limbs. Both left-handed and right-handed participants performed rhythmic bimanual coordination tasks (in-phase and antiphase coordination), while directing attention to either limb. Using brief mechanical perturbations, the degree to which the limbs were influenced by each other was determined. The results revealed that the non-dominant limb was more strongly affected by the dominant limb than vice versa and that, in line with Peters' proposition, this handedness-related asymmetry in coupling strength was reduced when attention was focused on the non-dominant limb, thereby highlighting the potential relation between inherent (handedness-related) asymmetries and voluntary attentional asymmetries. In contrast to previous findings, the (commonly observed) phase lead of the dominant limb was attenuated (rather than accrued) when attention was focused on this limb. This unexpected result was explained in terms of the observed attention-related difference in amplitude between the limbs.