Planning "discrete" movements using a continuous system: insights from a dynamic field theory of movement preparation.
Planning "discrete" movements using a continuous system: insights from a dynamic field theory of movement preparation.
复制标题
使用连续系统规划“离散”运动：来自运动准备动态场理论的见解。
DOI：
10.1123/mcj.11.2.166
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发表时间：
2007
期刊：
影响因子：
1.1
通讯作者：
Spencer,JohnP
中科院分区：
文献类型：
--
作者：
Schutte,AnneR;Spencer,JohnP
Ghez及其同事（1997）开发的时间启动范式揭示了两种运动规划模式：连续和离散。当目标间距小于60°时，发生连续响应；当目标间距大于60°时，发生离散响应。虽然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，即动态场理论，认为两种模式可以灵活地从同一系统中出现。实验1使用修改后的任务复制了连续和离散的性能，以允许对单个系统视图进行关键测试。在实验2中，参与者被允许在动作开始后纠正他们的动作（标准任务不允许纠正）。结果表明，在大目标和小目标分离时，规划性能是连续的。这些结果与这两种模式反映单个规划系统的时间依赖性“预成型”的建议一致。
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° of spatial angle, and discrete responding occurs when targets are separated by greater than 60°. 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.