Expanding and contracting optic-flow patterns and vection
Expanding and contracting optic-flow patterns and vection
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DOI：
10.1068/p5781
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发表时间：
2008-01-01
期刊：
影响因子：
1.7
通讯作者：
Palmisano, Stephen
中科院分区：
文献类型：
--
作者：
Bubka, Andrea;Bonato, Frederick;Palmisano, Stephen
当静止的观察者看到光流模式时，会产生视觉诱导的自运动知觉（vection）和一种称为模拟器病（SS）的晕动病。先前的结果表明，扩张流型比收缩流型产生更多的SS。感觉冲突，SS的一个可能的原因，可能更突出时，扩大光流模式的看法。一项实验进行了测试，如果一个更显著的感官冲突伴随扩大流模式可能会抑制向量。参与者（n = 15）在一个巨大的后投影屏幕上观看蓝色正方形的图案，这些正方形要么稳步扩大，要么收缩。用计算机接口滑动装置测量了30 s的矢量起始和量级。当观察到一个收缩模式时，矢量开始明显更快，矢量强度更强。我们认为，我们对前向自我运动的丰富经验可能会形成一种神经预期（暴露-hi故事），即通常伴随着扩张流的感觉输入。然而，由于反向自我运动不太常见，因此收缩流的暴露故事可能较弱，因此这些模式产生的感觉冲突较少，随后的矢量也较少。
When stationary observers view an optic-flow pattern, visually induced self-motion perception (vection) and a form of motion sickness known as simulator sickness (SS), can result. Previous results suggest that an expanding flow pattern leads to more SS than a contracting pattern. Sensory conflict, a possible cause of SS, may be more salient when an expanding optic-flow pattern is viewed. An experiment was conducted to test if a more salient sensory conflict accompanying expanding flow patterns might inhibit vection. Participants (n = 15) viewed a pattern of blue squares, either steadily expanded or contracted, on a large rear-projection screen. Vection onset and magnitude were measured for 30 s with a computer-interfaced slide device. Vection onset was significantly faster, and vection magnitude stronger, when a contracting pattern was viewed. We propose that our extensive experience with forward self-motion may form a neural expectancy (exposure-hi story) about the sensory inputs which typically accompany expanding flow. However, since backward self-motion is less common, there may be a weaker exposure-hi story for contracting flow, and as a result these patterns generate less salient sensory conflict and subsequently less vection.