PHASE-TRANSITIONS IN RHYTHMIC TRACKING MOVEMENTS - A CASE OF UNILATERAL COUPLING
PHASE-TRANSITIONS IN RHYTHMIC TRACKING MOVEMENTS - A CASE OF UNILATERAL COUPLING
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DOI：
10.1016/0167-9457(92)90062-g
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发表时间：
1992-02-01
影响因子：
2.1
通讯作者：
VANWIERINGEN, PCW
中科院分区：
文献类型：
--
作者：
WIMMERS, RH;BEEK, PJ;VANWIERINGEN, PCW
先前的研究表明，当运动频率增加时，人体内和人之间以反相模式（相对相位180度）协调的两肢会自发地切换到同相模式（相对相位0度）。这些相变满足物理分岔的标准。目前的实验将这一发现推广到与外部驱动的视觉信号的运动相协调的单肢（下臂）的运动。结果支持这样的观点：协调节奏运动中的相变是由于系统的信息分辨率限制的存在，因此被理解为“阈值非线性”。一旦在特定的行为模式中由于系统参数的变化而达到阈值，当且仅当存在另一种可用的行为模式时才会发生相变，在该行为模式下可以以较低的信息成本满足全局任务目标。如果任务的空间条件的操纵方式使得指定行为的信息与行为生成的信息之间的关系对于两种行为模式（同相、反相）是相同的，则不会发生相变，
Previous research has demonstrated that both within and between persons two limbs coordinated in an anti-phase mode (relative phase of 180 degrees) spontaneously switch to an in-phase mode (relative phase of 0 degrees) when movement frequency is increased. These phase transitions satisfy the criteria of physical bifurcations. The present experiments generalize this finding to movements of a single limb (lower arm) coordinated with the motion of an externally driven visual signal. The results support the idea that phase transitions in coordinated rhythmic movements are due to the presence of informational resolution limitations of the system, and are therefore to be understood as 'threshold non-linearities'. Once in a particular behavioural mode a threshold is reached due to changes in a system parameter, a phase transition occurs if, and only if, there is another behavioural mode available under which the global task goals can be satisfied at lower informational costs. If the spatial conditions of the task are manipulated in such a way that the relation between the information specifying the behaviour and the information generated by the behaviour is identical for both behavioural modes (in-phase, anti-phase), no phase transitions occur,