Beuter A, Haverkamp H, Glass L, Carrière L
Department of Kinanthropology, University of Québec at Montréal, Canada.
Int J Neurosci. 1995 Dec;83(3-4):281-94. doi: 10.3109/00207459508986345.
Thirteen healthy subjects were asked to maintain a constant index finger position in Experiment 1 or a constant eye position in Experiment 2 using visual feedback. The finger or eye position along with a stationary baseline target was displayed on an oscilloscope placed in front of the subject. Experiments 1 and 2 were carried out under sixteen combinations of delay and amplification of displacement on the screen (i.e., gain). In Experiment 1, increasing the gain in the visual feedback decreased the Root Mean Square (RMS) errors while increasing the delay increased these errors. An interaction between gains and delays was also observed in Experiment 1. In Experiment 2, the RMS errors were systematically higher than those recorded in Experiment 1 for the finger. No systematic pattern was recognized across all conditions of gains and delays for eye movements in Experiment 2. This study clearly illustrates differences in dynamics of motor control systems regulating eye and finger positions, respectively.
在实验1中，13名健康受试者被要求利用视觉反馈保持食指位置恒定；在实验2中，要求保持眼睛位置恒定。受试者前方放置的示波器上显示了手指或眼睛的位置以及一个固定的基线目标。实验1和实验2在屏幕上位移延迟和放大倍数（即增益）的16种组合条件下进行。在实验1中，视觉反馈中增益增加会降低均方根（RMS）误差，而延迟增加则会增大这些误差。实验1中还观察到增益和延迟之间的相互作用。在实验2中，眼睛运动的RMS误差在所有增益和延迟条件下均无系统规律。本研究清楚地说明了分别调节眼睛和手指位置的运动控制系统在动力学方面的差异。
