Depth cue reweighting requires altered correlations with haptic feedback
Depth cue reweighting requires altered correlations with haptic feedback
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DOI：
10.1167/19.14.3
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发表时间：
2019-12-01
影响因子：
1.8
通讯作者：
Domini, Fulvio
中科院分区：
文献类型：
--
作者：
Cesanek, Evan;Domini, Fulvio
深度线索重加权是一个反馈驱动的学习过程，它改变了知觉判断和/或运动规划中不同来源的三维形状信息的相对影响。在这项研究中，我们研究了支持重新加权的立体声和纹理信息通过操纵触觉反馈过程中获得的一系列把握运动的机制。在每次抓握结束时，手指会关闭一个与两个线索中的一个一致的物理对象，这取决于条件。以前的研究表明，这种风格的视觉训练会导致知觉判断的线索重新加权，但时间过程从未被记录为一个单一的训练课程，许多问题仍然存在关于潜在的机制，如驱动重新加权所需的反馈信号的模式。我们在两个实验中解决这些问题，发现短期的变化，在电机响应一致的线索重新加权：相对于可靠的线索的斜率的抓地力孔径增加，而相对于不可靠的线索的斜率下降。重要的是，实验2表明，斜率变化不会发生时，一个线索是呈现一个恒定的偏见;抓地力光圈只是变得均匀更大或更小。我们的研究结果支持一个模型的提示重新加权驱动的触觉反馈和个人的线索之间的相关性改变，而不是简单的不匹配，这可以解决其他机制，如感觉运动适应或线索重新校准。
Depth cue reweighting is a feedback-driven learning process that modifies the relative influences of different sources of three-dimensional shape information in perceptual judgments and or motor planning. In this study, we investigated the mechanism supporting reweighting of stereo and texture information by manipulating the haptic feedback obtained during a series of grasping movements. At the end of each grasp, the fingers closed down on a physical object that was consistent with one of the two cues, depending on the condition. Previous studies have shown that this style of visuomotor training leads to cue reweighting for perceptual judgments, but the time course has never been documented for a single training session, and many questions remain regarding the underlying mechanism, such as the pattern of feedback signals required to drive reweighting. We address these issues in two experiments, finding short-term changes in the motor response consistent with cue reweighting: the slope of the grip aperture with respect to the reliable cue increased, whereas the slope with respect to the unreliable cue decreased. Critically, Experiment 2 shows that slope changes do not occur when one of the cues is rendered with a constant bias; the grip aperture simply becomes uniformly larger or smaller. Our findings support a model of cue reweighting driven by altered correlations between haptic feedback and individual cues, rather than simple mismatches, which can be resolved by other mechanisms such as sensorimotor adaptation or cue recalibration.