PDF(Pubmed)
Abstract：
Interacting with the environment often requires the integration of visual and haptic information. Notably, perceiving external objects depends on how our brain binds sensory inputs into a unitary experience. The feedback provided by objects when we interact (through our movements) with them might then influence our perception. In VR, the interaction with an object can be dissociated by the size of the object itself by means of \'colliders\' (interactive spaces surrounding the objects). The present study investigates possible after-effects in size discrimination for virtual objects after exposure to a prolonged interaction characterized by visual and haptic incongruencies. A total of 96 participants participated in this virtual reality study. Participants were distributed into four groups, in which they were required to perform a size discrimination task between two cubes before and after 15 min of a visuomotor task involving the interaction with the same virtual cubes. Each group interacted with a different cube where the visual (normal vs. small collider) and the virtual cube\'s haptic (vibration vs. no vibration) features were manipulated. The quality of interaction (number of touches and trials performed) was used as a dependent variable to investigate the performance in the visuomotor task. To measure bias in size perception, we compared changes in point of subjective equality (PSE) before and after the task in the four groups. The results showed that a small visual collider decreased manipulation performance, regardless of the presence or not of the haptic signal. However, change in PSE was found only in the group exposed to the small visual collider with haptic feedback, leading to increased perception of the cube size. This after-effect was absent in the only visual incongruency condition, suggesting that haptic information and multisensory integration played a crucial role in inducing perceptual changes. The results are discussed considering the recent findings in visual-haptic integration during multisensory information processing in real and virtual environments.
摘要：
与环境交互通常需要整合视觉和触觉信息。值得注意的是,感知外部物体取决于我们的大脑如何将感官输入绑定到统一的体验中。当我们（通过我们的运动）与物体互动时，物体提供的反馈可能会影响我们的感知。在VR中,与对象的交互可以通过“碰撞器”（对象周围的交互空间）通过对象本身的大小来分离。本研究调查了暴露于以视觉和触觉不一致为特征的长时间交互后，虚拟对象在尺寸辨别方面可能产生的后遗症。共有96名参与者参加了这项虚拟现实研究。参与者分为四组，其中要求他们在视觉运动任务的15分钟之前和之后执行两个立方体之间的大小区分任务，该任务涉及与相同虚拟立方体的交互。每个组与不同的立方体交互，其中视觉(正常与小型对撞机)和虚拟立方体的触觉(振动与没有振动)特征被操纵。交互的质量(所执行的触摸和试验的数量)被用作因变量以研究视觉运动任务中的性能。为了测量尺寸感知中的偏差，我们比较了四组任务前后主观平等点(PSE)的变化.结果表明，小型视觉对撞机降低了操纵性能，无论触觉信号是否存在。然而,仅在暴露于具有触觉反馈的小型视觉对撞机的组中发现PSE的变化，导致对立方体大小的感知增加。这种后遗症在唯一的视觉不一致条件下是不存在的，这表明触觉信息和多感觉整合在诱导感知变化中起着至关重要的作用。考虑到在真实和虚拟环境中进行多感信息处理期间视觉触觉集成的最新发现，对结果进行了讨论。
