The crowding factor method applied to parafoveal vision.
The crowding factor method applied to parafoveal vision.
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DOI：
10.1167/16.11.30
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发表时间：
2016-09-01
影响因子：
1.8
通讯作者：
Walker L
中科院分区：
文献类型：
--
作者：
Ghahghaei S;Walker L
拥挤随着偏心率的增加而增加，并且最容易在外围观察到。然而，在自然、主动的视觉过程中，中央视觉起着重要作用。在中心视力中，通过测量临界距离来估计拥挤度是很困难的，因为这些距离很小。侧翼与目标的任何重叠都可能会产生重叠掩蔽混淆。拥挤因子方法通过同时调节目标尺寸和侧翼距离并使用比率来比较拥挤和不拥挤的条件来避免这个问题。该方法在外围开发并应用（Petrov & Meleshkevich，）。在这项工作中，我们应用该方法来表征具有空间不确定性的中央凹视觉（<3.5 视觉度数）的拥挤。我们发现偏心率和半场对拥挤的影响比外围小，但径向/切向不对称性明显保留。参与者之间观察到相当大的特质差异。拥挤因子方法提供了一个强大的工具来检查中央和周边视觉的拥挤情况，这对于未来寻求了解自然、主动观看条件下的视觉处理的研究非常有用。
Crowding increases with eccentricity and is most readily observed in the periphery. During natural, active vision, however, central vision plays an important role. Measures of critical distance to estimate crowding are difficult in central vision, as these distances are small. Any overlap of flankers with the target may create an overlay masking confound. The crowding factor method avoids this issue by simultaneously modulating target size and flanker distance and using a ratio to compare crowded to uncrowded conditions. This method was developed and applied in the periphery (Petrov & Meleshkevich,). In this work, we apply the method to characterize crowding in parafoveal vision (<3.5 visual degrees) with spatial uncertainty. We find that eccentricity and hemifield have less impact on crowding than in the periphery, yet radial/tangential asymmetries are clearly preserved. There are considerable idiosyncratic differences observed between participants. The crowding factor method provides a powerful tool for examining crowding in central and peripheral vision, which will be useful in future studies that seek to understand visual processing under natural, active viewing conditions.
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