SIZE INVARIANCE IN VISUAL NUMBER DISCRIMINATION
SIZE INVARIANCE IN VISUAL NUMBER DISCRIMINATION
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DOI：
10.1007/bf00920482
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发表时间：
1991-12-01
影响因子：
2.3
通讯作者：
VOS, PG
中科院分区：
文献类型：
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作者：
ALLIK, J;TUULMETS, T;VOS, PG
这项研究涉及观察者辨别两个随机点图案的数量的能力，而不考虑它们的相对大小。这两种图形中的一种是参考图形，总是由32个随机分布在AK×Kinvision正方形窗口(K=1.92°)内的点组成。第二种是5种放大倍数(K=0.64°、1.28°、1.92°、2.56°、3.20°)之一的测试图形，其相对点数在11个水平上变化(N=−15、−12、−9、−6、−3、0、3、6、9、12或15个点)。观察者的任务是指出两种图案中哪一种含有更多的点。结果表明，刺激大小作为一个不相关的刺激属性，在判断相对个数时可以忽略不计。这意味着感知到的数字是大小不变的，至少对于测试模式的1.6倍放大和3倍缩小而言是如此。观察到的尺寸不变性限制了潜在模型的范围，因为感知的数量只能通过刺激的特征来识别，该特征在绝对刺激大小改变后将保持不变。
This study deals with the observer's ability to discriminate the numerosity of two random dot-patterns irrespective of their relative size. One of these two patterns was a reference one that was always composed of 32 dots randomly distributed within aK×Kinvisible square window (K= 1.92°). The second one was the test pattern with one of the five magnifications (K= 0.64°, 1.28°, 1.92°, 2.56°, 3.20°) and the relative number of dots varied on 11 levels (N= −15, −12, −9, −6, −3, 0, 3, 6, 9, 12, or 15 dots). The observer's task was to indicate which of the two patterns contained more dots. The results show that the stimulus size, as an irrelevant stimulus attribute, can be ignored in the judgements about relative numerosity. This means that the perceived numerosity is size invariant, at least for a 1.6-times magnification and a 3-times reduction of the test pattern. The size invariance observed constrains the range of potential models, since the perceived numerosity can be identified only by means of a feature of the stimulus that will remain invariant after any change in the absolute stimulus size.