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首页> 外文期刊>Journal of vision >Redefining the Metric of Visual Space: Visual Field Boundaries Influence Attentional Resolution and Crowding Performance
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Redefining the Metric of Visual Space: Visual Field Boundaries Influence Attentional Resolution and Crowding Performance

机译：重新定义视觉空间的度量标准：视野边界影响注意力分辨率和拥挤性能

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摘要

Perceptual asymmetries exist for a variety of tasks. Here we show that one such asymmetry is explained by a new metric of visual space that is based on an individuala??s visual field borders. Sixteen subjects performed a crowding task in which they were required to judge the orientation of a grating presented above or below fixation, either alone or flanked by four similar gratings. Previous studies have shown that participants are better at judging the orientation of the crowded grating along the lower vertical meridian than the upper vertical meridian. It has been theorized that this asymmetry is due to differences in the resolving power of spatial attention that are biased toward the lower field due to ecological factors. However, the upper and lower visual fields are asymmetrically bounded, with upper visual field extents (VFE) smaller than lower VFE. The metric we propose takes this anatomical asymmetry into account, replacing degrees of visual angle with a distance measure that is relative to VFE for a given radial direction, termed percentage of visual field extent (%VFE). To assess whether this metric could account for perceptual asymmetries, we measured each participanta??s upper and lower VFE and used these values to compute %VFE for the 20?° grating locations. The crowding displays were then presented at 20?° above/below fixation and at matched locations (in units of %VFE) in the opposite hemifield. We found that the asymmetry in crowding performance was largely accounted for by individual variability in visual field extent (R[sup]2[/sup]=0.54). Importantly, this asymmetry is eliminated when the locations of stimuli are equated using the new metric (i.e., locations with equal %VFE). These results challenge the assumption that degrees of visual angle is the most appropriate metric for visual space and suggest that attentional resolution in crowding is more symmetric than previously thought.
机译：存在针对各种任务的感知不对称。在这里，我们表明，这种不对称性是由一种基于个体视野边界的视觉空间新度量来解释的。 16名受试者执行了一项拥挤任务，其中要求他们判断单独或与四个类似光栅侧接的固定物上方或下方呈现的光栅的方向。先前的研究表明，参与者比沿上垂直子午线更好地判断拥挤的光栅沿下垂直子午线的方向。从理论上讲，这种不对称性是由于空间注意的分辨力的差异所致，这些差异由于生态因素而偏向低场。但是，上视野和下视野是不对称限制的，上视野范围（VFE）小于下视野。我们提出的度量标准考虑到了这种解剖学上的不对称性，用相对于VFE的距离度量替换了视角角度，该距离度量对于给定的径向方向称为视野范围的百分比（％VFE）。为了评估该度量标准是否可以解决感知不对称问题，我们测量了每个参与者的上，下VFE，并使用这些值来计算20°°光栅位置的％VFE。然后，在固定的上方/下方20°°处以及对面的半场中的匹配位置（以％VFE为单位）展示拥挤的显示器。我们发现，拥挤表现的不对称性很大程度上是由视野范围内的个体差异引起的（R [sup] 2 [/ sup] = 0.54）。重要的是，当使用新指标将刺激位置等同时（即，％VFE相等的位置），消除了这种不对称性。这些结果挑战了视角度是视觉空间最合适的度量的假设，并表明拥挤时的注意分辨率比以前认为的更加对称。

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