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The Role of Stereo Vision in Visual-Vestibular Integration

机译：立体视觉在视觉-前庭融合中的作用

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摘要

Self-motion through an environment stimulates several sensory systems, including the visual system and the vestibular system. Recent work in heading estimation has demonstrated that visual and vestibular cues are typically integrated in a statistically optimal manner, consistent with Maximum Likelihood Estimation predictions. However, there has been some indication that cue integration may be affected by character-istics of the visual stimulus. Therefore, the current experiment evaluated whether presenting optic flow stimuli stereoscopically, or presenting both eyes with the same image (binocularly) affects combined visual—vestibular heading estimates. Participants performed a two-interval forced-choice task in which they were asked which of two pre-sented movements was more rightward. They were presented with either visual cues alone, vestibular cues alone or both cues combined. Measures of reliability were obtained for both binocular and stereoscopic conditions. Group level analyses demonstrated that when stereoscopic information was available there was clear ev-idence of optimal integration, yet when only binocular information was available weaker evidence of cue integration was observed. Exploratory individual analyses demonstrated that for the stereoscopic condition 90% of participants exhibited optimal integration, whereas for the binocular condition only 60% of partici-pants exhibited results consistent with optimal integration. Overall, these findings suggest that stereo vision may be important for self-motion perception, particularly under combined visual—vestibular conditions.
机译：通过环境进行自我运动会刺激多种感觉系统，包括视觉系统和前庭系统。航向估计的最新工作表明，视觉和前庭线索通常以统计上最佳的方式进行整合，这与最大似然估计的预测一致。但是，已经有迹象表明提示整合可能会受到视觉刺激特征的影响。因此，当前的实验评估了立体呈现视觉流刺激，或双眼呈现相同图像（双眼）是否会影响合并的视觉－前庭方位。参与者执行了两个时间间隔的强制选择任务，询问他们两个预先提出的动作中哪个更向右。他们要么单独获得视觉提示，要么获得前庭提示，要么同时获得两种提示。在双目和立体条件下均获得了可靠性的度量。小组水平的分析表明，当可以获得立体信息时，有明显的最佳整合证据，但是，当只有双目信息可用时，则观察到较弱的提示整合证据。探索性的个人分析表明，在立体状态下，有90％的参与者表现出最佳整合，而在双眼状态下，只有60％的参与者表现出与最佳整合一致的结果。总体而言，这些发现表明，立体视觉对于自我运动知觉可能很重要，特别是在视觉-胫骨结合的情况下。

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