Sensory weighting and realignment: independent compensatory processes
Sensory weighting and realignment: independent compensatory processes
复制标题
DOI：
10.1152/jn.00641.2010
复制
发表时间：
2011-07-01
影响因子：
2.5
通讯作者：
Bastian, Amy J.
中科院分区：
文献类型：
--
作者：
Block, Hannah J.;Bastian, Amy J.
Block HJ，Bastian AJ.感觉加权和重新排列：独立的补偿过程。J Neurophysiol 106：59-70，2011.首次发布于2011年4月13日; doi：10.1152/jn.00641.2010。-当估计一只手的位置以达到用另一只手到达它的目的时，人类具有目标手的位置的视觉和本体感受估计。这些被认为是加权和组合，以形成一个综合估计，以这种方式，方差最小化。如果视觉和本体感受的估计不一致，神经系统通过空间重新排列一个或两个来将它们重新对齐可能是有利的。可能的是，重新对准由权重确定，在这种情况下，较低权重的模态应该总是比较高权重的模态更多地重新对准。另一种可能性是，重新对准和加权过程是独立控制的，并且可以用于补偿感觉失准。在这里，我们施加了视觉和本体感受的目标手的位置估计之间的错位，旨在实现任务，以允许同时，独立的测量重量和调整。在实验1中，我们使用端点视觉反馈来创建一种情况，在这种情况下，理论上可以通过加权或重新排列策略来实现任务成功，但视觉必须被视为正确对齐的方式来实现成功。实验2中，没有终点视觉反馈。我们发现，在前一种情况下，重新排列独立于权重，但在后一种情况下则不然，这表明，虽然在某些情况下，权重和重新排列可能会一起起作用，但它们是生物学上独立的过程，使人类在补偿感官扰动时具有行为灵活性。
Block HJ, Bastian AJ. Sensory weighting and realignment: independent compensatory processes. J Neurophysiol 106: 59-70, 2011. First published April 13, 2011; doi:10.1152/jn.00641.2010.-When estimating the position of one hand for the purpose of reaching to it with the other, humans have visual and proprioceptive estimates of the target hand's position. These are thought to be weighted and combined to form an integrated estimate in such a way that variance is minimized. If visual and proprioceptive estimates are in disagreement, it may be advantageous for the nervous system to bring them back into register by spatially realigning one or both. It is possible that realignment is determined by weights, in which case the lower-weighted modality should always realign more than the higher-weighted modality. An alternative possibility is that realignment and weighting processes are controlled independently, and either can be used to compensate for a sensory misalignment. Here, we imposed a misalignment between visual and proprioceptive estimates of target hand position in a reaching task designed to allow simultaneous, independent measurement of weights and realignment. In experiment 1, we used endpoint visual feedback to create a situation where task success could theoretically be achieved with either a weighting or realignment strategy, but vision had to be regarded as the correctly aligned modality to achieve success. In experiment 2, no endpoint visual feedback was given. We found that realignment operates independently of weights in the former case but not in the latter case, suggesting that while weighting and realignment may operate in conjunction in some circumstances, they are biologically independent processes that give humans behavioral flexibility in compensating for sensory perturbations.