Unfocussed spatial attention underlies the crowding effect in indirect form vision
Unfocussed spatial attention underlies the crowding effect in indirect form vision
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DOI：
10.1167/5.11.8
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发表时间：
2005-01-01
影响因子：
1.8
通讯作者：
Strasburger, H
中科院分区：
文献类型：
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作者：
Strasburger, H
我们通过测量左右两侧有侧翼的角色的识别对比敏感度，研究了间接形式视觉中拥挤效应的机制。注意力和特征对效果的贡献可以通过一种新的范式来区分，该范式区分模式位置错误和模式识别错误，并进一步通过出现在目标之前 150 毫秒的位置提示来操纵空间注意力的聚焦。测量是在水平子午线上以 1、2 和 4 度偏心率进行的，并使用了一系列侧翼距离。我们的结果表明，在正常的间接观看中，拥挤对字符识别的损害——特别是在中间侧翼距离处——很大程度上是由空间上不精确的注意力集中造成的。相比之下，短暂位置线索对表现的增强似乎是通过单独的注意力机制介导的，使得注意力轨迹和焦点是独立控制的。我们的结果还为模式识别中的内容和位置的单独编码提供了心理物理学支持。
We studied mechanisms underlying the crowding effect in indirect form vision by measuring recognition contrast sensitivity of a character with flankers to the left and right. Attentional and featural contributions to the effect can be separated by a new paradigm that distinguishes pattern location errors from pattern recognition errors and further by manipulating the focusing of spatial attention through a positional cue, appearing 150 ms before the target. Measurements were on the horizontal meridian, at 1, 2, and 4 deg eccentricity, and a range of flankers' distances were used. Our results show that in normal indirect viewing, the impairment of character recognition by crowding is-in particular at intermediate flanker distances-caused to a large part by spatially imprecise focusing of attention. In contrast, the enhancement of performance by a transient positional cue seems mediated through a separate attentional mechanism such that attentional locus and focus are controlled independently. Our results furthermore lend psychophysical support to a separate coding of the what and where in pattern recognition.