Schutte Anne R, Spencer John P
Dept of Psychology, University of Nebraska-Lincoln, Lincoln, NE 68388-0308, USA.
Motor Control. 2007 Apr;11(2):166-208. doi: 10.1123/mcj.11.2.166.
The timed-initiation paradigm developed by Ghez and colleagues (1997) has revealed two modes of motor planning: continuous and discrete. Continuous responding occurs when targets are separated by less than 60 degrees of spatial angle, and discrete responding occurs when targets are separated by greater than 60 degrees . Although these two modes are thought to reflect the operation of separable strategic planning systems, a new theory of movement preparation, the Dynamic Field Theory, suggests that two modes emerge flexibly from the same system. Experiment 1 replicated continuous and discrete performance using a task modified to allow for a critical test of the single system view. In Experiment 2, participants were allowed to correct their movements following movement initiation (the standard task does not allow corrections). Results showed continuous planning performance at large and small target separations. These results are consistent with the proposal that the two modes reflect the time-dependent "preshaping" of a single planning system.
由盖兹及其同事（1997年）开发的定时启动范式揭示了两种运动规划模式：连续模式和离散模式。当目标之间的空间角度小于60度时，会出现连续反应；当目标之间的空间角度大于60度时，会出现离散反应。尽管这两种模式被认为反映了可分离的战略规划系统的运作，但一种新的运动准备理论——动态场理论表明，这两种模式是从同一系统中灵活出现的。实验1使用经过修改的任务复制了连续和离散表现，以便对单一系统观点进行关键测试。在实验2中，参与者在运动启动后被允许纠正他们的动作（标准任务不允许纠正）。结果显示，在目标间距大与小的情况下都有连续的规划表现。这些结果与以下观点一致，即这两种模式反映了单一规划系统随时间变化的“预塑形”。
