Bidet-Ildei Christel, Méary David, Orliaguet Jean-Pierre
Laboratory of Psychology and Neurocognition CNRS, UMR 5105, Université Pierre Mendès, 38040 Grenoble Cedex 9, France.
Neurosci Lett. 2008 Jan 17;430(3):236-40. doi: 10.1016/j.neulet.2007.10.040. Epub 2007 Nov 6.
The aim of this experiment was to show that the visual preference for isochronic movements does not necessarily imply a motor simulation and therefore, does not depend on the kinematics of the perceived movement. To demonstrate this point, the participants' task was to adjust the velocity (the period) of a dot that depicted an elliptic motion with different perimeters (from 3 to 60 cm). The velocity profile of the movement conformed ("natural motions") or not ("unnatural motions") to the law of co-variation velocity-curvature (two-thirds power law), which is usually observed in the production of elliptic movements. For each condition, we evaluated the isochrony principle, i.e., the tendency to prefer constant durations of movement irrespective to changes in the trajectory perimeter. Our findings indicate that isochrony principle was observed whatever the kinematics of the movement (natural or unnatural). Therefore, they suggest that the perceptive preference for isochronic movements does not systematically imply a motor simulation.
本实验的目的是表明，对等时运动的视觉偏好并不一定意味着运动模拟，因此，不依赖于所感知运动的运动学特征。为了证明这一点，参与者的任务是调整描绘椭圆运动的点的速度（周期），该椭圆运动具有不同的周长（从3厘米到60厘米）。运动的速度曲线符合（“自然运动”）或不符合（“非自然运动”）速度-曲率协变定律（三分之二次幂定律），这一规律通常在椭圆运动的产生过程中被观察到。对于每种情况，我们评估了等时性原则，即无论轨迹周长如何变化，都倾向于偏好运动持续时间恒定的趋势。我们的研究结果表明，无论运动的运动学特征如何（自然或非自然），都能观察到等时性原则。因此，它们表明对等时运动的感知偏好并不系统地意味着运动模拟。
