Flexible strategies for sensory integration during motor planning
Flexible strategies for sensory integration during motor planning
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DOI：
10.1038/nn1427
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发表时间：
2005-04-01
影响因子：
25
通讯作者：
Sabes, PN
中科院分区：
文献类型：
--
作者：
Sober, SJ;Sabes, PN
在规划目标指向的到达动作时，人类受试者结合视觉和本体感觉反馈来形成对手臂位置的两种估计：一种是规划到达方向，另一种是将该方向转换为运动指令。这些位置估计基于相同的感觉信号，但依赖于视觉和本体感觉输入的不同组合，这表明大脑根据执行的计算对感觉输入进行不同的加权。在这里，我们表明，视觉和本体感觉的相对权重取决于目标的感觉通道和视觉反馈的信息内容，并且这些因素独立地影响规划的两个阶段。观察到的权重的多样性证明了感觉整合的灵活性，并提出了大脑选择感觉输入的统一原则，以最大限度地减少因感觉信号在坐标系之间的转换而产生的误差。
When planning target-directed reaching movements, human subjects combine visual and proprioceptive feedback to form two estimates of the arm's position: one to plan the reach direction, and another to convert that direction into a motor command. These position estimates are based on the same sensory signals but rely on different combinations of visual and proprioceptive input, suggesting that the brain weights sensory inputs differently depending on the computation being performed. Here we show that the relative weighting of vision and proprioception depends both on the sensory modality of the target and on the information content of the visual feedback, and that these factors affect the two stages of planning independently. The observed diversity of weightings demonstrates the flexibility of sensory integration and suggests a unifying principle by which the brain chooses sensory inputs so as to minimize errors arising from the transformation of sensory signals between coordinate frames.