Are summary statistics enough? Evidence for the importance of shape in guiding visual search
Are summary statistics enough? Evidence for the importance of shape in guiding visual search
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DOI：
10.1080/13506285.2014.890989
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发表时间：
2014-03-16
期刊：
影响因子：
2
通讯作者：
Zelinsky, Gregory J.
中科院分区：
文献类型：
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作者：
Alexander, Robert G.;Schmidt, Joseph;Zelinsky, Gregory J.
注意力焦点以外的周边视觉可能依赖于汇总统计。我们使用了凝视条件范式，通过询问搜索性能是否在目标和相同目标的精确匹配的可视化之间存在差异来直接测试这一假设。四对象搜索显示包括一个在第一眼运动期间被替换为对象的未改变版本的匹配对象。目标是通过预演指定的，从未改变过。测试了两种类型的几何匹配对象：一种保持全局形状，另一种没有。当形状不被保留时，目标和精确匹配的物体之间的指导差异被发现，这表明它们在信息上是不等价的。当形状不被保留时，目标固定后的反应也较慢，这表明再次使用形状信息的目标的中心凹外处理。我们的结论是，汇总统计必须包括一些全球形状信息近似搜索过程中使用的周边信息。
Peripheral vision outside the focus of attention may rely on summary statistics. We used a gaze-contingent paradigm to directly test this assumption by asking whether search performance differed between targets and statistically-matched visualizations of the same targets. Four-object search displays included one statistically-matched object that was replaced by an unaltered version of the object during the first eye movement. Targets were designated by previews, which were never altered. Two types of statistically-matched objects were tested: One that maintained global shape and one that did not. Differences in guidance were found between targets and statistically-matched objects when shape was not preserved, suggesting that they were not informationally equivalent. Responses were also slower after target fixation when shape was not preserved, suggesting an extrafoveal processing of the target that again used shape information. We conclude that summary statistics must include some global shape information to approximate the peripheral information used during search.