立体图对的尺寸变化对立体感可塑性的影响

为了解随机点立体图对(Random-Dot Stereogram简称RDS)空间参数的变化是否影响整体立体感的可塑性(Plasticity of global stereopsis),我们利用微机化的伪随机点立体图对发生器设计了三个心理物理实验.第一个实验,使RDS图对中两幅图中的一幅,在水平和垂直两个方向上改变尺寸,第二个实验,仅改变在水平方向的尺寸,第三个实验,只改变在垂直方向上的尺寸.立体视觉正常的十名被试在立体镜下观察这些图形,当达到双眼融合时,观测RDS图对左右两图之间尺寸差别的限度,结果表明,当在水平方向上尺寸变化时,尺寸差别的限度为最大,在垂直方向上尺寸变化时.尺寸差别的限度次于前者,当在水平和垂直双向变化尺寸时,尺寸差别的限度为最小,对不同视角的RDS图对,达到双眼融合时,视角本身的大小对尺寸差别的限度无显著性(?)(?).

THE EFFECT OF CHANGING SIZE OF RDS ON THE PLASTICITY OF STEREOPSIS

In order to study the effect of different spatial parameters of RDS on the plasticity of stereopsis, three sets of psychophysical experiments were conducted under the following stimulus conditions.The first one was changing the size of one of two-half pictures of RDS in both horizontal and vertical directions. The second was changing of the size in horizontal direction and the third was changing of the size in vertical direction.The results showed that when the size of one half-picture of RDS was changed in different directions, the limitations of plasticity of stereopsis (LPS) were significant. The LPS was the smallest in the first experiment, the LPS was the largest in the second experiment and the LPS is middle in the third experiment.For 3 sizes of RDS, the effect of their size on the LPS was not significant.