Is the anisotropy of perceived 3-D shape invariant across scale?
Is the anisotropy of perceived 3-D shape invariant across scale?
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DOI：
10.3758/bf03211961
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发表时间：
1999-04-01
期刊：
影响因子：
--
通讯作者：
Philbeck, JW
中科院分区：
文献类型：
--
作者：
Loomis, JM;Philbeck, JW
一些研究已经导致了3-D感知各向异性的发现，由此，在深度方向上的空间间隔被感知为小于在额平行平面中的物理上相等的间隔。在这个实验中，我们研究了这种各向异性是否是尺度不变的。刺激是由两个杆创建的L形平放在水平草地上，一个杆定义一个frontoparallel间隔，另一个定义一个深度间隔。观察员单眼和双眼在两个尺度上观察L形，使得它们在单眼观看下投影相等。观察者判断每个形状的纵横比（深度/宽度）。判断的纵横比表示知觉各向异性，这是不变的尺度为单眼观看，但不是双眼观看，当视角保持不变，单眼观看结果在知觉各向异性，这是不变的跨越这两个尺度，大概跨越更大的尺度。这种尺度不变性表明，在这些条件下，形状的感知是独立于大小的感知来确定的。
A number of studies have resulted in the finding of a 3-D perceptual anisotropy, whereby spatial intervals oriented in depth are perceived to be smaller than physically equal intervals in the frontoparallel plane. In this experiment, we examined whether this anisotropy is scale invariant. The stimuli were L shapes created by two rods placed flat on a level grassy field, with one rod defining a frontoparallel interval, and the other, a depth interval. Observers monocularly and binocularly viewed L shapes at two scales such that they were projectively equivalent under monocular viewing. Observers judged the aspect ratio (depth/width) of each shape. Judged aspect ratio indicated a perceptual anisotropy that was invariant with scale for monocular viewing, but not for binocular viewing, When perspective is kept constant, monocular viewing results in perceptual anisotropy that is invariant across these two scales and presumably across still larger scales. This scale invariance indicates that the perception of shape under these conditions is determined independently of the perception of size.