Investigation of spatial organization based on chromatic signals

本研究探讨了色度加工对空间组织的贡献。空间组织是指将视觉上相似的元素组合在一起，并将一组元素与其周围环境分开的视觉功能。在第一个研究中，我们研究了空间组织中亮度和色度加工之间交互作用的性质。结果揭示了复杂和不对称的相互作用。在一定条件下，通过引入随机亮度噪声可以促进基于色度信号的空间组织，而基于亮度信号的空间组织从来不会被色度噪声所促进。此外，当刺激元素密集堆积，易化交互作用消失，基于颜色信号的组织在大对比度范围内独立于亮度噪声时，交互作用本质上随刺激的空间构型而变化。在第二项研究中，我们研究了基于彩色信号的空间组织是否会影响三维结构从运动中的恢复。结果表明，空间组织对三维结构的恢复有调节作用。当不同速度的运动点因颜色不同而被分离时，恢复的三维结构在某些空间形态上更接近于垂直结构，本研究结果阐明了色度加工中介空间组织的本质及其与其他视觉加工的关系。他们还表明，视觉加工调节空间组织的性质随着刺激的空间配置而不同。我们还需要进一步的研究来了解空间配置对空间组织的影响。

This research project investigated chromatic processing contributing to spatial organization. Spatial organization refers to the visual function which groups visually similar elements together and segregates the group of elements from its surroundings.In the first study, we investigated the nature of the interaction between luminance and chromatic processings in spatial organization. The results revealed complex and asymmetric interactions. Spatial organization based on chromatic signals was facilitated under some conditions by introducing random luminance noises, whereas organization based on luminance signals was never facilitated by chromatic noises. Moreover, the interaction varied in nature with the spatial configuration of the stimulus When the stimulus elements were densely packed, the facilitatory interaction disappeared and the organization based on chromatic signals was independent of luminance noises over a wide contrast range. In the second study, we investigated whether spatial organization based on chromatic signals affects the recovery of three-dimensional (3-D) structure from motion. The results showed that the spatial organization can modulate the recovery of 3-D structure. When the moving dots of different speeds were segregated due to a difference in color, the recovered 3-D structure was closer in shape to the veridical structure in some spatial configuration.Overall, the results of this research project elucidated the nature of chromatic processing mediating spatial organization and how it is related to other visual processings. They also suggest that visual processing mediating spatial organization vary in nature with the spatial configuration of the stimulus. We need further studies to understand the effects of the spatial configuration on spatial organization.