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现实场景搜索时来自眼的指导:颜色在中央和周边视觉中的作用

Nuthmann A, Malcolm GL

期刊名称:J VISION 视觉杂志

卷期:第16卷(2016年)2期

关键词:

摘要

 视觉系统利用环境特征调节定位到目标对象时凝视的有效性。虽然以前的研究已经分离出各种功能对凝视指导用处,这些研究通常采用稀疏显示器且并没有研究特征如何依据视野位置促进功能搜索。目前的研究调查了真实世界的搜索过程中整个视野,特别是颜色便于指导目光的功能。凝视依存的窗口伴随参与者的眼球运动,把颜色信息限制在指定的区域。场景影像全彩色呈现,外围彩色和中心灰色或者外围灰色中心彩色,或不同灰度呈现。颜色条件与搜索提示操作合并,使用一个带有字标签或精准的图片的线索目标。随着场景中色彩信息减少,搜索时间增加。搜索时间基于注视的数据分解揭示了以颜色为媒介对搜索特定的子进程的作用。在外围视觉颜色促进目标定位,而中心视觉色彩促进目标核查。图像线索协助搜索,线索特异性和场景颜色相结合的影响。条件允许时,视觉系统利用了环境的颜色信息,以利于基于视野内位置的不同的真实世界的视觉搜索的行为。

The visual system utilizes environmental features to direct gaze efficiently when locating objects. While previous research has isolated various features’ contributions to gaze guidance, these studies generally used sparse displays and did not investigate how features facilitated search as a function of their location on the visual field. The current study investigated how features across the visual field-particularly color-facilitate gaze guidance during real-world search. A gaze-contingent window followed participants’ eye movements, restricting color information to specified regions. Scene images were presented in full color, with color in the periphery and gray in central vision or gray in the periphery and color in central vision, or in grayscale. Color conditions were crossed with a search cue manipulation, with the target cued either with a word label or an exact picture. Search times increased as color information in the scene decreased. A gaze-data based decomposition of search time revealed color-mediated effects on specific subprocesses of search. Color in peripheral vision facilitated target localization, whereas color in central vision facilitated target verification. Picture cues facilitated search, with the effects of cue specificity and scene color combining additively. When available, the visual system utilizes the environment’s color information to facilitate different real-world visual search behaviors based on the location within the visual field.
 

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