Reduction in sensitivity to radial optic-flow congruent with ego-motion
Reduction in sensitivity to radial optic-flow congruent with ego-motion
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DOI：
10.1016/j.visres.2012.04.008
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发表时间：
2012-06
期刊：
影响因子：
1.8
通讯作者：
Nobu Shirai;S. Ichihara
中科院分区：
文献类型：
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作者：
Nobu Shirai;S. Ichihara
视觉运动，如径向光流，是在自我运动过程中感知方向的重要线索。先前的几项研究已经报道，径向光流的感知速度被低估时，径向光流和非视觉（如前庭或/和本体感受）信息之间的自我运动方向是一致的。在本研究中，我们研究是否敏感性不同类型的光流（径向与层流）相互作用，前庭输入以不同的方式通过使用另一种方法：而不是估计的视觉运动模式的感知速度，我们测量运动相干阈值。结果表明，当航向由径向光流模式表示时，视觉和前庭感觉输入与自我运动方向一致的条件下的径向光流敏感性显著低于视觉前庭输入与自我运动方向不一致的条件。这些结果表明，在自我运动事件中，一致性前庭输入降低了径向光流敏感性。另一方面，当自我运动的方向表示为层流的光流，结果与径向光流所观察到的不同。这些数据表明，前庭输入有一定的影响，光流灵敏度，但前庭输入的效果的大小可能不同的不同的流动模式，如径向和层流的光流。
Visual motion, such as radial optic flow, is an important cue for perceiving direction during ego-motion. Several previous studies have reported that the perceived speed of a radial optic flow is underestimated when the represented ego-motion direction between radial optic flow and non-visual (such as vestibular or/and proprioceptive) information is congruent. In the present study, we examined whether sensitivity to different types of optic flow (radial vs. laminar) interacts with vestibular input in different ways by using another method: instead of estimating the perceived speed of the visual motion pattern, we measured motion-coherence thresholds. The results indicated that when the heading direction was represented by a radial optic-flow pattern, the radial optic-flow sensitivity was significantly lower under the condition where the visual and vestibular sensory input were congruent with the ego-motion direction than under the condition where the visuo-vestibular input and ego-motion were incongruent. These results indicated that radial optic-flow sensitivity was decreased by the congruent vestibular input during the ego-motion event. On the other hand, when the direction of ego-motion was represented by a laminar optic flow, the results were different from those observed with radial optic flows. These data suggest that vestibular input has some effect on optic-flow sensitivity but that the magnitude of the effect of vestibular input may differ between distinct flow patterns such as radial and laminar optic flows.