Observers have less confidence in perceiving self-motion direction from visual and vestibular information when the multimodal integration is in the optimal range
Observers have less confidence in perceiving self-motion direction from visual and vestibular information when the multimodal integration is in the optimal range
复制标题
当多模态整合处于最佳范围时，观察者对从视觉和前庭信息感知自我运动方向的信心较低
DOI：
10.1167/16.12.1202
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发表时间：
2016
影响因子：
1.8
通讯作者：
Kenzo Sakurai
中科院分区：
文献类型：
--
作者：
Ryo Tachibana;William Beaudot;Kenzo Sakurai
自我运动的感知方向可以从正交定向的视觉和前庭刺激进行多模式整合（Sakurai等人，2003年，2010年）。当观察者被动地经历真实的振荡向前/向后的躯体运动，同时观看与前/后躯体运动一致的前/后视觉流模式时，他们感知到的自我运动方向是由视觉和前庭信息单独指定的那些方向的中间。为了扩展这些研究，我们引入了多个层次的身体运动方向和视觉指定的运动方向之间的角度差异。我们通过测量自我运动的感知方向和观察者的置信度来研究多模态整合的最佳范围。参与者坐在电动秋千上的可旋转椅子上，戴着头戴式显示器。视觉刺激包括平移垂直正弦波光栅锁相摆动运动。前庭刺激来自身体振荡运动，椅子的13个方向之一（0至180度，间隔15度）相对于摆动的路径。在0度条件下，被试的正/负躯体运动及其时相与视觉刺激一致，而在其他条件下则不一致。受试者通过指向杆的任务来指示他们感知的自我运动方向，然后用5分制表示他们对判断的信心。自我运动的感知方向是中间指定的视觉和前庭信息在60度，75度和90度的条件下，在加权组合的方式，这表明这些是最佳的整合条件。平均置信度，但是，在这些最佳条件下比在其他条件下较低。在15度和30度条件下，感知方向大于真实的躯体运动方向，而在120度、135度、150度和165度条件下，感知方向接近真实的躯体运动方向，这表明在这些条件下，前庭信息在多模态整合中占主导地位。
Perceived directions of self-motion can be multimodally integrated from orthogonally directed visual and vestibular stimulation (Sakurai et al., 2003, 2010). When observers passively experience real oscillatory forward/backward somatic motion while viewing leftward/rightward visual flow patterns consistent with rightward/leftward body motion, their perceived self-motion direction is intermediate to those specified by visual and vestibular information individually. To extend these studies, we introduced multiple levels of angular differences between body-motion direction and visually specified motion direction. We investigated the optimal range of the multimodal integration by measuring the perceived direction of self-motion and observers' confidence ratings. Participants were seated on a rotatable chair on a motor-driven swing and wore a head-mounted display. The visual stimuli consisted of translating vertical sine-wave gratings phase-locked to the swing motions. The vestibular stimulation was from somatic oscillatory motion with one of 13 orientations of the chair (0 to 180 degrees in 15-degree intervals) relative to the path of the swing. In the 0-degree condition the participants' leftward/rightward somatic motion and its phase were congruent with the visual stimuli, while they were incongruent in other conditions. Participants were sound-cued to indicate their perceived direction of self-motion via a rod-pointing task, and then indicated their confidence of judgments with a 5-point scale. The perceived directions of self-motion were intermediate to those specified by visual and vestibular information in 60-, 75-and 90-degree conditions in a weighted combination fashion, suggesting these are optimal conditions for integration. Average confidence ratings, however, were lower in these optimal conditions than those in other conditions. The perceived directions were larger than the real somatic motion directions in 15-and 30-degree conditions, while they were close to the real somatic motion directions in 120-, 135-, 150-, and 165-degree conditions, suggesting vestibular information was dominant in multimodal integration in these conditions.