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歧义图的双稳态知觉是一种非常有趣的视觉现象,但对其机制还不十分清楚.采用“运动产生的结构”(structurefrom-motion)的歧义图和无歧义的对照图,我们研究了这一问题.被试者在报告对歧义图和无歧义图的知觉发生翻转时,其瞳孔都扩张,而且在翻转之后都达到峰值;与无歧义图条件下不同,在报告知觉翻转前,歧义图条件下的瞳孔要明显小于均值,而在瞳孔扩张达到峰值之后,瞳孔仍然明显大于均值.这些结果说明知觉翻转后的瞳孔扩张是一个表达被试知觉状态已改变的指标.而对歧义图和无歧义图刺激的瞳孔反射的差异,可能反映了由歧义图所产生知觉翻转的神经信号和知觉状态的内源性.另外,被试眼动扫视的方向会随着运动轴的变化呈现不同的扫视分布模式,但在歧义图与无歧义图之间分布模式是一致的,这不仅表明被试从歧义图中感知到了与无歧义图同样的信息,也表明瞳孔反射变化与双稳态知觉变化相关的结论具有可靠性.本文对歧义图双稳态知觉的视觉机制提供了新的认识.
Bistable perception of ambiguity is a very interesting visual phenomenon, but its mechanism is not yet known. Using the “structure from-motion” ambiguity graph and unambiguous contrast map, we Studied the problem.When subjects reported reversal of perception of ambiguity graph and un-ambiguity graph, their pupils dilated and both peaked after flipped, while in the condition without ambiguity graph, , The pupil under ambiguous condition was significantly less than the mean value, while the pupil was still significantly larger than the mean value after the pupil dilation peaked.These results indicate that the pupil dilatation after perceived turnover is an indicator that the subject’s perceived status has changed, while the ambiguity Differences in pupillary reflexes between the images and unambiguous plots may reflect the endogenous perception signals and perceptual states of perceptual flips generated by the ambiguity map.In addition, the direction of the eye movements of the subjects is changed according to the motion axis However, the pattern of distribution between ambiguous graph and unambiguous graph is consistent, which not only shows that participants perceive the same signal from the ambiguous graph as the ambiguous graph , Also shows that pupillary changes associated with changes in bistable perception of the reliability of conclusions. In this paper, ambiguous figure provides a new understanding of the mechanism of bistable visual perception.