Slezak Emily, Coia Andrew J, Shevell Steven K
University of Chicago, Department of Psychology, Chicago, IL, USA.
J Vis. 2019 Nov 1;19(13):5. doi: 10.1167/19.13.5.
A coherent percept of our visual world is important for functioning. Ambiguities, however, are implicit in visual neural representations and must be resolved for stable perception of objects and scenes. Grouping processes can link multiple neurally ambiguous fragments across the visual field. Experiments here determined how multiple visual features of each fragment contribute to perceptual resolution of ambiguity by grouping. Chromatic interocular-switch rivalry, a technique for presenting competing dichoptic images, was used to induce ambiguous neural representations for equiluminant chromatic discs and gratings. Two dichoptic stimuli were presented simultaneously to measure the amount of time they both appeared the same in at least one feature domain. The two stimuli were grouped when they appeared to share ambiguous features such as color, orientation, and spatial frequency more often than chance. Experiments here tested whether unshared and unambiguous features impeded grouping of the ambiguous components. Overall, the results show that grouping can be driven by neural ambiguity that is common for fragments across the visual field, even when the fragments also have other unshared, unambiguous features.
对我们的视觉世界形成连贯的感知对正常功能很重要。然而，视觉神经表征中隐含着模糊性，必须加以解决才能稳定地感知物体和场景。分组过程可以将视野中多个神经上模糊的片段联系起来。这里的实验确定了每个片段的多个视觉特征如何通过分组促进对模糊性的感知分辨。彩色双眼切换竞争是一种呈现竞争性双眼图像的技术，用于诱导等亮度彩色圆盘和光栅的模糊神经表征。同时呈现两个双眼刺激，以测量它们在至少一个特征域中看起来相同的时间量。当两个刺激看起来比随机情况更频繁地共享颜色、方向和空间频率等模糊特征时，它们就会被分组。这里的实验测试了非共享和明确的特征是否会阻碍模糊成分的分组。总体而言，结果表明，分组可以由整个视野中片段共有的神经模糊性驱动，即使这些片段也有其他非共享的、明确的特征。
