Visual delay affects force scaling and weight perception during object lifting in virtual reality
Visual delay affects force scaling and weight perception during object lifting in virtual reality
复制标题
视觉延迟会影响虚拟现实中物体提升过程中的力缩放和重量感知
DOI：
10.1152/jn.00396.2018
复制
发表时间：
2019
影响因子：
2.5
通讯作者：
Marco Davare
中科院分区：
文献类型：
--
作者：
Vonne van Polanen;Robert Tibold;Atsuo Nuruki;Marco Davare
提升物体需要基于物体重量的预测来精确缩放指尖力。在物体接触时，出现了一系列触觉和视觉事件，需要在线快速处理以微调用于举起物体的计划运动命令。在短暂的感觉运动事件中，多感觉整合的大脑机制还不清楚，这是需要手-物相互作用的动作的一般特征。在这项研究中，我们测试了触觉和视觉信号之间的相对权重时，他们被集成到电机命令在线。我们使用了一种新的虚拟现实设置来对触觉的视觉反馈进行去感知，这使我们能够探测触觉和视觉在驱动参与者的运动时的相对贡献，当他们抓住由两个力反馈机器人模拟的虚拟物体时。我们发现，视觉延迟改变了指尖力产生的轮廓，并导致参与者认为物体比没有视觉延迟的情况下进行升降机时更重。我们进一步模拟了视觉对运动输出的影响，方法是操纵延迟视觉事件可能使力分布产生偏差的程度，这使我们能够确定大脑分配给触觉和视觉的具体权重。我们的研究结果显示，第一次如何处理视觉触觉集成在离散的感觉运动事件控制对象升降动态，并进一步突出了组织的多感官信号在线控制action and perception.NEW & NOTEWORTHYDexterous手的运动需要快速整合的信息从不同的感官，特别是触摸和视觉，在不同的关键时间点的运动展开。视觉和触觉之间的相对权重对象操作是未知的。我们在虚拟现实中使用对象提升来对视觉和触觉反馈进行去噪，并找出它们的相对权重。我们的研究结果揭示了如何快速的多感觉整合处理一系列离散的感觉运动控制点。
Lifting an object requires precise scaling of fingertip forces based on a prediction of object weight. At object contact, a series of tactile and visual events arise that need to be rapidly processed online to fine-tune the planned motor commands for lifting the object. The brain mechanisms underlying multisensory integration serially at transient sensorimotor events, a general feature of actions requiring hand-object interactions, are not yet understood. In this study we tested the relative weighting between haptic and visual signals when they are integrated online into the motor command. We used a new virtual reality setup to desynchronize visual feedback from haptics, which allowed us to probe the relative contribution of haptics and vision in driving participants’ movements when they grasped virtual objects simulated by two force-feedback robots. We found that visual delay changed the profile of fingertip force generation and led participants to perceive objects as heavier than when lifts were performed without visual delay. We further modeled the effect of vision on motor output by manipulating the extent to which delayed visual events could bias the force profile, which allowed us to determine the specific weighting the brain assigns to haptics and vision. Our results show for the first time how visuo-haptic integration is processed at discrete sensorimotor events for controlling object-lifting dynamics and further highlight the organization of multisensory signals online for controlling action and perception.NEW & NOTEWORTHYDexterous hand movements require rapid integration of information from different senses, in particular touch and vision, at different key time points as movement unfolds. The relative weighting between vision and haptics for object manipulation is unknown. We used object lifting in virtual reality to desynchronize visual and haptic feedback and find out their relative weightings. Our findings shed light on how rapid multisensory integration is processed over a series of discrete sensorimotor control points.