Number estimation relies on a set of segmented objects
Number estimation relies on a set of segmented objects
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DOI：
10.1016/j.cognition.2009.07.002
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发表时间：
2009-10-01
期刊：
影响因子：
3.4
通讯作者：
Alvarez, G. A.
中科院分区：
文献类型：
--
作者：
Franconeri, S. L.;Bemis, D. K.;Alvarez, G. A.
我们如何估计一个集合中的对象数量？两种类型的视觉表现可能构成这种能力的基础--未分割的视觉图像或分割的离散对象的集合。我们控制单个物体是相互隔离的，还是通过不相关的线成对分组的。如果数字估计是在未分割的图像上进行的，则此操作不应影响估计。但是，如果数字估计依赖于分割的图像，那么将对象对分组到单个单元中应该会导致较低的估计。在实验1中，参与者低估了分组物体的数量，相对于连接线被折断的不相连物体。实验2提供的证据表明，这种分割过程广泛发生在整个对象集上。在实验3中，阶梯程序提供了低估效应的定量测量。实验4表明，对于单条细线，分组效应的强度是相同的，并且可以通过线上的小断裂来消除这种影响。这些结果提供了直接证据，证明数字估计依赖于分段输入。(C)2009爱思唯尔B.V.保留所有权利。
How do we estimate the number of objects in a set? Two types of visual representations might underlie this ability - an unsegmented visual image or a segmented collection of discrete objects. We manipulated whether individual objects were isolated from each other or grouped into pairs by irrelevant lines. If number estimation operates over an unsegmented image, then this manipulation should not affect estimates. But if number estimation relies on a segmented image, then grouping pairs of objects into single units should lead to lower estimates. In Experiment 1 participants underestimated the number of grouped objects, relative to disconnected objects in which the connecting lines were 'broken'. Experiment 2 presents evidence that this segmentation process occurred broadly across the entire set of objects. In Experiment 3, a staircase procedure provides a quantitative measure of the underestimation effect. Experiment 4 shows that the strength of the grouping effect was equally strong for a single thin line, and the effect can be eliminated by a small break in the line. These results provide direct evidence that number estimation relies on a segmented input. (C) 2009 Elsevier B.V. All rights reserved.