The role of target salience in crowding
The role of target salience in crowding
复制标题
DOI：
10.1068/p5206
复制
发表时间：
2005-01-01
期刊：
影响因子：
1.7
通讯作者：
Morgan, MJ
中科院分区：
文献类型：
--
作者：
Felisberti, FM;Solomon, JA;Morgan, MJ
我们研究了“拥挤”的paraftera使用方向识别的Gabor目标的任务，和侧翼的Gabor上的等偏心圆作为干扰。附近的侧翼干扰提高了方向辨别阈值。这种拥挤效应随着干扰物数量的增加而增加，随着目标和干扰物之间的空间分离而减少。当目标在干扰器阵列的中心时，拥挤度最大，当目标在阵列的边缘时，拥挤度最小。当目标位置未知且目标与干扰物之间的空间距离较大时，指示目标位置的线索可提高绩效，但当距离较小时，线索没有显著影响。增加目标相对于干扰物的对比度可以减少拥挤，但是对比度比干扰物小的目标甚至比相同对比度的目标更难识别。将目标和干扰物放置在不同的深度平面上，可以减少某些观察者的拥挤，但存在质的个体差异。一个大的（比如说，45度）目标和干扰物之间的方向差异导致目标在在场/缺席任务中“弹出”，尽管其他研究的证据表明，在这些条件下仍然存在拥挤。我们的结论是，突出，充其量，拥挤的影响不大。
We studied 'crowding' in the parafovea using orientation identification of a Gabor target as the task, and flanking Gabors on an isoeccentric circle as distractors. Orientation-discrimination thresholds were raised by nearby flanking distractors. This crowding effect was increased by the number of distractors and decreased by the spatial separation between target and distractors. Crowding was greatest when the target was in the centre of the distractor array and smallest when the target was on the edge of the array. A cue indicating the position of the target improved performance when the position was otherwise unknown and the spatial separation between target and distractors was large, but the cue had no significant effect when separation was small. Increasing the contrast of the target relative to the distractors reduced crowding, but targets of smaller contrast than that of the distractors are even harder to identify than those of the same contrast. Putting the target and distractors in different depth planes decreased crowding for some observers, but there were qualitative individual differences. A large (say, 45 degrees) difference in orientation between target and distractors caused the target to 'pop out' in a presence /absence task, despite the evidence from other studies that crowding is still found in these conditions. We conclude that salience has, at best, modest effects on crowding.