Symmetry, broken symmetry, and handedness in bimanual coordination dynamics
Symmetry, broken symmetry, and handedness in bimanual coordination dynamics
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双手协调动力学中的对称性、对称性破缺和惯用手
DOI：
10.1007/bf00230426
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发表时间：
2004
影响因子：
2
通讯作者：
M. Turvey
中科院分区：
文献类型：
--
作者：
P. Treffner;M. Turvey
1∶1节律双手协调的对称动力学可以由一个包含节律成分之间相对相位的序参量方程和一个决定同相和反相模式相对吸引力的肢间耦合来描述。这些动力学的对称性破坏可以通过左右节奏分量的自然频率差Δω或身体的固有不对称动力学来发生。后者是由额外的条款，使对称耦合略有各向异性捕获。从这一步骤得到的主要预测是，尽管Δω=0，但随着协调频率的增加，非对称耦合将增加，对称耦合将减少。这导致了左撇子更大的左肢偏向和右撇子的右肢偏向。在一项实验中，20名左撇子和20名右利手的人与手持的刚性手柄进行1∶ 1协调，证实了这种“惯用手增加”的预测。左右摆长度的操纵控制Δω，耦合频率由节拍器确定。还证实了以下预测：当Δω > 0时，左撇子和右撇子中由于内在不对称性而导致的平衡从同相和反相的小偏移应被放大，当Δω < 0时，左撇子和右撇子中的小偏移应被放大。此外，左撇子的偏见是更一致的比右撇子的偏见，并确定了一个亚组的右撇子谁表现类似于左撇子。功能不对称的协调动力学提供了对肢体之间的基本协同作用的见解，调节它的动力机制，以及左撇子和右撇子个体的不对称性的性质。
SummaryThe symmetrical dynamics of 1∶1 rhythmic bimanual coordination may be specified by an order parameter equation involving the relative phase between rhythmic components, and an interlimb coupling which determines the relative attractiveness of in-phase and anti-phase patterns. Symmetry breaking of these dynamics can occur via the difference in the natural frequencies, Δω, of the left and right rhythmic components, or by the intrinsic asymmetrical dynamics of the body. The latter is captured by additional terms that render the symmetrical coupling slightly anisotropic. A major prediction resulting from this step is that although Δω=0, as the frequency of coordination is increased, the asymmetrical coupling will increase and the symmetrical coupling will decrease. This results in a greater left-limb bias in left-handers and right-limb bias in right-handers. This “increased handedness” prediction was confirmed in an experiment in which 20 left-handed and 20 right-handed individuals performed 1∶ 1 coordination with hand-held rigid pendulums. Manipulations of left and right pendulum lengths controlled Δω, and the coupled frequency was determined by a metronome. Also confirmed was the prediction that the small shift in equilibria from in-phase and anti-phase due to the intrinsic asymmetry should be amplified in left-handers when Δω > 0 and in right-handers when Δω < 0. Further, the bias in left-handers was more consistent than the bias in right-handers, and a subgroup of right-handers was identified who performed similarly to left-handers. The coordination dynamics of functional asymmetry provides insights into the elementary synergy between the limbs, the dynamical mechanism that modulates it, and the nature of the asymmetry in left-handed and right-handed individuals.
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DOI：
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