Perfiliev S, Pettersson L G
Institute of Physiology, St. Petersburg State University, Russia.
Exp Brain Res. 1998 Jun;120(4):510-8. doi: 10.1007/s002210050425.
Three cats were trained to perform target-reaching to a horizontal tube with food placed at shoulder level, and the kinematic characteristics of the movements were investigated by recording the trajectory of the wrist. From the very onset of training, a vertical obstacle was placed in front of the cats. The obstacle forced the animals to perform movements with an initial phase dominated by limb-lifting to position the wrist above the obstacle, followed by a second phase of protraction towards the tube; in the sagittal plane, the movement paths were segmented with an upwards convexity. After a training period of 1 year (about 7000 movements), the obstacle was removed. All cats then quickly (within a few trials) changed the trajectory so that the main part of protraction now occurred in parallel with limb-lifting during the first half of the movement. The initial slope of the sagittal movement path became less steep and the upwards convexity less pronounced. Such trajectories, which predominated for several experiments after removal of the obstacle, were only slightly different from those observed in control cats not trained with an obstacle. The results are discussed in relation to a previously proposed hypothesis of motor "imprinting" during extensive training in a particular experimental paradigm.
训练三只猫对放置在肩部高度的水平管进行触物取食，并通过记录腕部轨迹来研究其运动的运动学特征。从训练一开始，就在猫的前方放置一个垂直障碍物。这个障碍物迫使动物进行的运动，其初始阶段以抬起肢体将腕部置于障碍物上方为主，随后是朝向管子伸展的第二阶段；在矢状面内，运动路径呈向上凸起的分段状。经过1年的训练期（约7000次运动）后，移除障碍物。然后所有的猫都迅速（在几次试验内）改变了轨迹，使得伸展的主要部分现在在运动的前半段与肢体抬起同时进行。矢状运动路径的初始斜率变得没那么陡，向上的凸起也没那么明显。在移除障碍物后的几次实验中，这种轨迹占主导，与未经过障碍物训练的对照猫所观察到的轨迹只有细微差别。结合之前提出的关于在特定实验范式的广泛训练中运动“印记”的假设对结果进行了讨论。
