Persistent grasping errors produce depth cue reweighting in perception
Persistent grasping errors produce depth cue reweighting in perception
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DOI：
10.1016/j.visres.2020.09.007
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发表时间：
2021-01-01
期刊：
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;Taylor, Jordan A.;Domini, Fulvio
当抓取的物体比预期的大或小时，触觉反馈会自动重新校准运动规划。有趣的是，触觉反馈也可以通过一种称为深度线索重加权的过程来影响3D形状感知。尽管线索重加权的特征也出现在运动行为中，但尚不清楚这种运动重加权是上游知觉重加权的结果，还是一个单独的过程。我们认为知觉重塑与运动控制直接相关；尤其是，它是由持续性的系统性运动错误引起的，而这些错误不能仅通过运动重新校准来解决。在实验1中，我们反向改变纹理和立体提示以创建一组深度元对象：当纹理指定深度对象时，立体声指定浅对象，反之亦然，使得所有对象看起来都相同深。在匹配任务(前测)中，为每个参与者确定了产生这种知觉同色异谱的立体纹理配对。接下来，参与者反复抓住这些深度异构体，接受与一个线索正相关、与另一个负相关的触觉反馈，导致持续的运动错误。最后，参与者重复知觉匹配任务(后测)。在触觉反馈强化了纹理提示的情况下，知觉的变化与个人抓握性能的变化相关，这表明了知觉加权和改进的运动控制之间的联系。实验2表明，当通过标准运动适应快速纠正运动错误时，不会发生线索重调整。这些发现表明知觉和行动之间是相互依赖的，知觉直接指导行动，而行动产生错误信号，驱动运动和知觉学习。
When a grasped object is larger or smaller than expected, haptic feedback automatically recalibrates motor planning. Intriguingly, haptic feedback can also affect 3D shape perception through a process called depth cue reweighting. Although signatures of cue reweighting also appear in motor behavior, it is unclear whether this motor reweighting is the result of upstream perceptual reweighting, or a separate process. We propose that perceptual reweighting is directly related to motor control; in particular, that it is caused by persistent, systematic movement errors that cannot be resolved by motor recalibration alone. In Experiment 1, we inversely varied texture and stereo cues to create a set of depth-metamer objects: when texture specified a deep object, stereo specified a shallow object, and vice versa, such that all objects appeared equally deep. The stereo-texture pairings that produced this perceptual metamerism were determined for each participant in a matching task (Pretest). Next, participants repeatedly grasped these depth metamers, receiving haptic feedback that was positively correlated with one cue and negatively correlated with the other, resulting in persistent movement errors. Finally, participants repeated the perceptual matching task (Post-test). In the condition where haptic feedback reinforced the texture cue, perceptual changes were correlated with changes in grasping performance across individuals, demonstrating a link between perceptual reweighting and improved motor control. Experiment 2 showed that cue reweighting does not occur when movement errors are rapidly corrected by standard motor adaptation. These findings suggest a mutual dependency between perception and action, with perception directly guiding action, and actions producing error signals that drive motor and perceptual learning.