Niemann J, Winker T, Gerling J, Landwehrmeyer B, Jung R
Neurologische Universitätsklinik, Abteilung Neurophysiologie, Freiburg, Federal Republic of Germany.
Exp Brain Res. 1991;85(2):417-22. doi: 10.1007/BF00229418.
To study whether electrophysiological correlates of increasing motor skill can be demonstrated in man, we recorded cortical negative DC-potentials during the acquisition of a complex finger movement in 21 subjects. The movement consisted in moving a matchstick to and fro between the index finger (II) and the little finger (V). Cortical negative DC-potentials were recorded at Fz, Cz, C1, C2 and Pz. As a control a simple finger movement was performed during the same session by 7 of the Ss. Both tasks were repeated 60-80 times and averages of the first and the last 15 artifact-free single runs were compared. Whereas only a slight, inconstant decrease in surface electronegativity during the simple motor task was observed, a significant reduction in potential size occurred during the complex task at Cz (maximum), C1, C2 and Pz but not at Fz. In addition, a significant difference in the decrease of surface electronegativity between various electrode positions was observed. We suggest that these changes in potential size during the process of motor learning may reflect an altered cortical organisation of movement control during the acquisition of a complex motor task.
为了研究在人类中是否能够证明运动技能提高的电生理相关性，我们记录了21名受试者在习得一种复杂手指运动过程中的皮层负向直流电位。该运动是将一根火柴棒在食指（II）和小指（V）之间来回移动。在Fz、Cz、C1、C2和Pz处记录皮层负向直流电位。作为对照，7名受试者在同一时段内进行了简单的手指运动。两项任务均重复60 - 80次，并比较了前15次和后15次无伪迹单次运行的平均值。在简单运动任务期间，仅观察到表面负电性有轻微的、不稳定的下降，而在复杂任务期间，Cz（最大值）、C1、C2和Pz处的电位大小出现了显著降低，但Fz处未出现。此外，观察到不同电极位置之间表面负电性下降存在显著差异。我们认为，运动学习过程中电位大小的这些变化可能反映了在习得复杂运动任务期间运动控制的皮层组织发生了改变。
