不同视觉条件下的视动适应和双手间转移。
Visuomotor adaptation and intermanual transfer under different viewing conditions.
机构信息
Centre for Vision Research, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada.
出版信息
Exp Brain Res. 2010 May;202(3):543-52. doi: 10.1007/s00221-010-2155-0. Epub 2010 Jan 22.
Does the brain use a separate internal model for cursor mechanics during visuomotor adaptation? We compared the amount of adaptation and transfer to the opposite arm when subjects reached the targets under different viewing conditions of the arm during reaching. If the brain forms separate models, we predict a difference in the amount of adaptation and transfer for each viewing condition. If the brain forms one model, we predict equivalent amounts of adaptation and transfer between the two hands for each viewing condition. Separate groups of subjects performed a reaching task with either a rotated view of cursor motion representing their unseen hand or a rotated view of their actual hand. The two groups were further divided so that the magnitude of the rotation was either 45 degrees or 75 degrees counter-clockwise. After adapting to the rotation with one hand, subjects reached the same targets under the same viewing condition but with the opposite hand. Similar amounts of adaptation and intermanual transfer were found across the different magnitudes of rotation and across patterns of hand-order. Our results suggest that the brain may not be learning a distinct model for cursor mechanics, or if it is, it must be equivalent or overlapping with the arm model.
大脑在进行视动适应时是否会为光标力学使用单独的内部模型?我们比较了在手臂的不同观察条件下进行到达任务时,每个观察条件下适应和转移到相反手臂的量。如果大脑形成单独的模型,我们预测每个观察条件下适应和转移的量会有所不同。如果大脑形成一个模型,我们预测在每个观察条件下,两只手之间的适应和转移量相等。分别有两组受试者在手的看不见的手的光标运动的旋转视图或实际手的旋转视图下进行到达任务。两组进一步分为顺时针旋转 45 度或 75 度的角度。适应一只手的旋转后,受试者在相同的观察条件下用另一只手到达相同的目标。在不同的旋转幅度和手序模式下,发现适应和手间转移的量相似。我们的结果表明,大脑可能不会为光标力学学习一个独特的模型,或者如果它是,它必须与手臂模型相同或重叠。