Flexibility and individual differences in visuo-proprioceptive integration: evidence from the analysis of a morphokinetic control task
Flexibility and individual differences in visuo-proprioceptive integration: evidence from the analysis of a morphokinetic control task
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DOI：
10.1007/s00221-007-1140-8
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发表时间：
2008-02-01
影响因子：
2
通讯作者：
Rouhana, Joelle
中科院分区：
文献类型：
--
作者：
Boulinguez, Philippe;Rouhana, Joelle
运动控制中视觉本体感觉整合的相互冲突的理论表明，每种模态可以根据其统计可靠性或将使用综合估计的计算来加权。然而，大多数研究所基于的心理物理学实验都使用感觉冲突，因此可能反映特定行为而不是正常行为。在本文中，我们：（1）提出了一种避免使用感觉冲突（延迟回忆任务）的方法，（2）将我们的兴趣限制在自发行为而不是适应行为上，（3）专注于需要精细在线控制的复杂任务，以便手部运动在执行过程中适应精确路径。向受试者提供视觉、本体感觉或两者的提示，同时被动移动他们的右手以适应精确的三段路径。一旦这个编码阶段结束，他们就被指示通过视觉、本体感觉或同时使用这两种线索来主动再现轨迹。结果证明，视觉和本体感觉的使用可能非常不同，（1）不仅根据实际环境中感觉系统的相对分辨率，（2）不仅根据任务中涉及的过程，而且（3）根据受试者。他们还建议，视觉和本体感觉线索不会融合以提供加权平均位置，但当向受试者提供多种感官线索时，可以简单地忽略非主导线索。我们得出的结论是，这些观察结果中的每一个都说明了整合机制灵活性的相同基本属性。
Conflicting theories of visuo-proprioceptive integration in movement control suggest that each modality can be weighted according to either its statistical reliability or the computations in which the integrated estimates will be used. However, the psychophysical experiments on which most studies are based use sensory conflicts and are therefore likely to reflect particular rather than normal behavior. In this paper, we: (1) propose a method avoiding the use of sensory conflicts (delayed recall task), (2) restrict our interest to spontaneous rather than adapted behavior, and (3) focus on a complex task requiring fine online control in order for hand movements to fit a precise path during execution. Subjects were provided with either visual, proprioceptive or both cues while their right hand was passively moved to fit a precise three segment pathway. As soon as this encoding phase ended, they were instructed to reproduce actively the trajectory, either with vision, proprioception or both cues. Results provide evidence that vision and proprioception may be used very differently, (1) not only according to the relative resolution of the sensory systems in the actual context, (2) not only according to the processes involved in the task, but also (3) according to subjects. They also suggest that visual and proprioceptive cues are not fused to provide a weighted average position, but that the non-dominant cue could simply be ignored when subjects are provided with multiple sensory cues. We conclude that each of these observations illustrates the same fundamental property of flexibility of integrative mechanisms.