Selection of visual information for lightness judgements by eye movements
Selection of visual information for lightness judgements by eye movements
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DOI：
10.1098/rstb.2013.0056
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发表时间：
2013-10-19
影响因子：
6.3
通讯作者：
Gegenfurtner, Karl R.
中科院分区：
文献类型：
--
作者：
Toscani, Matteo;Valsecchi, Matteo;Gegenfurtner, Karl R.
在判断物体的亮度时，视觉系统必须考虑许多因素，如阴影、场景几何形状、遮挡或透明度。因此，问题是要根据亮度不同的多个局部样本来估计全局亮度。在这里，我们展示了眼睛注视在这个选择过程中起着突出的作用。我们探索了一种特殊的透明度情况，对于这种情况，视觉系统将表面反射从干涉条件中分离出来，以生成分层的图像表示。当观察者匹配分层刺激的亮度时，眼球运动被记录下来。我们发现，观察者确实将他们的注视集中在目标层，而这种抽样策略影响了他们对亮度的感知。图像分割对感知亮度的影响与注视策略高度相关，当我们使用凝视相关的显示来操纵图像分割时，图像分割对感知亮度的影响很大。最后，我们扰乱了分割过程，表明它因果地驱动了选择策略。因此，通过眼睛注视进行选择可以作为估计目标反射率的简单启发式方法。
When judging the lightness of objects, the visual system has to take into account many factors such as shading, scene geometry, occlusions or transparency. The problem then is to estimate global lightness based on a number of local samples that differ in luminance. Here, we show that eye fixations play a prominent role in this selection process. We explored a special case of transparency for which the visual system separates surface reflectance from interfering conditions to generate a layered image representation. Eye movements were recorded while the observers matched the lightness of the layered stimulus. We found that observers did focus their fixations on the target layer, and this sampling strategy affected their lightness perception. The effect of image segmentation on perceived lightness was highly correlated with the fixation strategy and was strongly affected when we manipulated it using a gaze-contingent display. Finally, we disrupted the segmentation process showing that it causally drives the selection strategy. Selection through eye fixations can so serve as a simple heuristic to estimate the target reflectance.