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首页> 美国卫生研究院文献>Journal of Neurophysiology >Looking for symmetry: fixational eye movements are biased by image mirror symmetry
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Looking for symmetry: fixational eye movements are biased by image mirror symmetry

机译：寻找对称性：固定眼的运动受到图像镜像对称性的影响

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摘要

Humans are highly sensitive to symmetry. During scene exploration, the area of the retina with dense light receptor coverage acquires most information from relevant locations determined by gaze fixation. We characterized patterns of fixational eye movements made by observers staring at synthetic scenes either freely (i.e., free exploration) or during a symmetry orientation discrimination task (i.e., active exploration). Stimuli could be mirror-symmetric or not. Both free and active exploration generated more saccades parallel to the axis of symmetry than along other orientations. Most saccades were small (<2°), leaving the fovea within a 4° radius of fixation. Analysis of saccade dynamics showed that the observed parallel orientation selectivity emerged within 500 ms of stimulus onset and persisted throughout the trials under both viewing conditions. Symmetry strongly distorted existing anisotropies in gaze direction in a seemingly automatic process. We argue that this bias serves a functional role in which adjusted scene sampling enhances and maintains sustained sensitivity to local spatial correlations arising from symmetry.
机译：人类对对称性高度敏感。在场景探索期间，具有密集光接收器覆盖的视网膜区域从注视固定所确定的相关位置获取大多数信息。我们描述了观察者自由地（即自由探索）或在对称方向辨别任务（即主动探索）中凝视合成场景的注视眼动模式。刺激可能是镜像对称的，也可能不是。自由探索和主动探索都产生了更多平行于对称轴的扫视，而不是沿着其他方向。大多数扫视镜较小（<2°），使中央凹在固定角4°内。扫视动力学分析表明，观察到的平行取向选择性在刺激发作的500毫秒内出现，并且在两种观察条件下均贯穿整个试验。对称性在看似自动的过程中在注视方向上严重扭曲了现有的各向异性。我们认为这种偏见起到了功能性作用，其中调整后的场景采样增强并保持了对对称性引起的局部空间相关性的持续敏感性。

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