Performance asymmetries and coupling dynamics in the acquisition of multifrequency bimanual coordination
Performance asymmetries and coupling dynamics in the acquisition of multifrequency bimanual coordination
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DOI：
10.1007/s004260050013
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发表时间：
1998-02-01
影响因子：
2.3
通讯作者：
Carson, RG
中科院分区：
文献类型：
--
作者：
Byblow, WD;Bysouth-Young, D;Carson, RG
16名没有受过正规音乐训练的右撇子参与者在一周的时间里进行了几个小时的有节奏的多频协调任务。研究了两组关于手对频率的分配：IL:2R，其中首选的右手执行更高的频率，以及2L:1R，其中非首选的左手执行更高的频率。在相对相稳定性方面的性能不对称是最初预期和证实的，1L:2R模式比2L:1R模式更稳定。有人认为，表演不对称是由于受利手性影响的四肢之间的不对称耦合造成的。本研究考察了两种模式中较不稳定的2L:1R的习得是否需要形成不对称耦合，从而使快的手对慢的手施加更大的压力，而慢的手对快的手施加更大的压力，这是许多关于双手多节奏敲击的研究中提出的假设。目前的数据提供了定量证据，表明在稳定性方面（通过相对相位均匀性、过渡路径和前导滞后关系来量化），手性不对称以及获得的不对称可以通过由对称和非对称耦合项组成的低维动力学来捕获。
Sixteen right-handed participants without formal musical training performed a rhythmic multifrequency coordination task for several hours over a one-week period. Two groups were studied with respect to the assignment of hand to frequency: IL:2R, in which the preferred right hand performed the higher frequency, and 2L:1R in which the non-preferred left hand performed the higher frequency. Performance asymmetries in terms of relative phase stability were initially expected and confirmed, The 1L:2R pattern was more stable than 2L:1R. It has been suggested that performance asymmetries result from asymmetrical coupling between the limbs as influenced by handedness. This study examined whether the acquisition of 2L:1R, the less stable of the two patterns, required the formation of asymmetrical coupling such that the faster hand would exert a greater forcing on the slower hand than vice versa, a supposition put forth in many studies of bimanual polyrhythmic tapping. The present data provide quantitative evidence that, in terms of stability (as quantified by relative phase uniformity, transition pathways, and lead-lag relations), handedness asymmetries, as well as acquired asymmetries, can be captured by low-dimensional dynamics consisting of symmetric and asymmetric coupling terms.