Schmidt R C, Carello C, Turvey M T
Center for the Ecological Study of Perception and Action, University of Connecticut, Storrs 06269.
J Exp Psychol Hum Percept Perform. 1990 May;16(2):227-47. doi: 10.1037//0096-1523.16.2.227.
By watching each other's lower oscillating leg, 2 seated Ss kept a common tempo and a particular phase relation of either 0 degrees (symmetric mode) or 180 degrees (alternate mode). This study investigated the differential stability of the 2 phase modes. In Experiment 1, in which Ss were instructed to remain in the initial phase mode, the alternate phase mode was found to be less stable as the frequency of oscillation increased. In addition, analysis of the nonsteady state cycles revealed evidence of a switching to the symmetric phase mode for the initial alternate phase mode trials. In Experiments 2 and 3, Ss were instructed to remain at a noninitial phase angle if it was found to be more comfortable. The transition observed between the 2 phase modes satisfies the criteria of a physical bifurcation--hysteresis, critical fluctuations, and divergence--and is consonant with previous findings on transitions in limb coordination within a person.
通过观察彼此摆动的下肢，两名坐着的受试者保持了共同的节奏以及0度（对称模式）或180度（交替模式）的特定相位关系。本研究调查了这两种相位模式的差异稳定性。在实验1中，受试者被要求保持初始相位模式，结果发现随着振荡频率的增加，交替相位模式的稳定性较差。此外，对非稳态周期的分析显示，在初始交替相位模式试验中存在切换到对称相位模式的证据。在实验2和3中，如果发现非初始相位角更舒适，受试者被要求保持在该角度。在这两种相位模式之间观察到的转变符合物理分岔的标准——滞后、临界波动和发散——并且与之前关于个体肢体协调性转变的研究结果一致。
