Department of Biomedical Kinesiology, Research Centre for Movement Control and Neuroplasticity, K.U. Leuven, Tervuursevest 101, 3001 Heverlee, Belgium.
Exp Brain Res. 2011 Jul;212(2):213-24. doi: 10.1007/s00221-011-2720-1. Epub 2011 May 12.
Here we investigated the influence of angular separation between visual and motor targets on concurrent adaptation to two opposing visuomotor rotations. We inferred the extent of generalisation between opposing visuomotor rotations at individual target locations based on whether interference (negative transfer) was present. Our main finding was that dual adaptation occurred to opposing visuomotor rotations when each was associated with different visual targets but shared a common motor target. Dual adaptation could have been achieved either within a single sensorimotor map (i.e. with different mappings associated with different ranges of visual input), or by forming two different internal models (the selection of which would be based on contextual information provided by target location). In the present case, the pattern of generalisation was dependent on the relative position of the visual targets associated with each rotation. Visual targets nearest the workspace of the opposing visuomotor rotation exhibited the most interference (i.e. generalisation). When the minimum angular separation between visual targets was increased, the extent of interference was reduced. These results suggest that the separation in the range of sensory inputs is the critical requirement to support dual adaptation within a single sensorimotor mapping.
在这里，我们研究了视觉和运动目标之间的角度分离对同时适应两个相反的视觉运动旋转的影响。我们根据是否存在干扰（负转移），从个体目标位置推断出相反的视觉运动旋转之间的泛化程度。我们的主要发现是，当每个旋转与不同的视觉目标相关联但共享共同的运动目标时，会发生双重适应。双重适应可以在单个感觉运动图内实现（即，与不同的视觉输入范围相关联的不同映射），或者通过形成两个不同的内部模型（选择哪个模型将基于目标位置提供的上下文信息）。在这种情况下，泛化模式取决于与每个旋转相关联的视觉目标的相对位置。与相反的视觉运动旋转的工作空间最接近的视觉目标表现出最大的干扰（即泛化）。当视觉目标之间的最小角度分离增加时，干扰的程度降低。这些结果表明，在单个感觉运动映射中支持双重适应的关键要求是感觉输入范围的分离。
