Department of Psychology, University of Toronto, Toronto, Canada.
Exp Brain Res. 2010 Mar;201(3):607-11. doi: 10.1007/s00221-009-2072-2. Epub 2009 Nov 11.
Fitts's Law for the timing of targeted movements states that, when target width is held constant, movement time (MT) will increase as the travelled distance increases. Even imagined movements, mentally simulated actions without actual actions, obey Fitts's Law. Recently, a violation of Fitts's Law has been reported; when targets occur in a structured array, MT to the farthest target is shorter than that predicted by Fitts's Law. We conducted two experiments to determine if the violation also occurs for imagined movements. Results showed a close correspondence between real and imaginary MTs across target locations, including the Fitts's violation for the farthest target. We conclude that the violation of Fitts's Law occurs in motor imagery and that the locus of the violation is in the planning stage of action.
菲茨定律（Fitts's Law）指出，在目标宽度保持不变的情况下，当运动距离增加时，运动时间（MT）将会增加。即使是想象中的运动，即没有实际动作的心理模拟动作，也遵守菲茨定律。最近，有报道称违反了菲茨定律；当目标出现在结构化的数组中时，到最远目标的 MT 比菲茨定律预测的要短。我们进行了两项实验，以确定想象中的运动是否也会违反该定律。结果表明，在目标位置上，真实和想象的 MT 之间存在密切的对应关系，包括对最远目标的菲茨定律违反。我们得出结论，违反菲茨定律发生在运动意象中，违反的位置在于动作的规划阶段。
