Why and how the vergence eye movement influences the space perception of visual object?

以人眼为实验对象，在汇聚角为唯一线索的情况下，对三维空间中视觉物体的大小和距离感知进行了实验研究。实验设备采用三维图像投影系统和大型透明屏幕（2.5m×2.5m）。实验对象通过液晶双目快门观看屏幕上的可视物体。屏幕上右眼和左眼的图形随双眼快门的频率交替切换。图形间的分离被CG计算机改变以呈现距离刺激。受试者操纵操纵杆来调整测试刺激的大小或距离，以重现记忆中的参考图形的大小或距离。在第一个实验中，被试记住参考点的大小，然后被试重新调整一个不同大小和不同距离的测试点，以适应记忆的尺寸或距离。大多数被试的尺寸复制精度较差，而少数被试的尺寸复制精度明显优于其他被试。距离繁殖的准确性也表现出较大的个体差异。距离繁殖精度的个体变异与大小繁殖精度的个体变异高度相关。这一事实表明，负责大小感知的神经网络是基于通过会聚眼运动获得的距离线索。在第二次实验中，研究了运动定义边缘物体尺寸再现的精度。与普通物体的精度无明显差异。运动定义边缘的尺寸再现精度与距离再现精度高度相关。这一发现表明，大脑中的大小感知神经网络在对普通物体和运动定义物体的形状进行加工后，都会对其进行信息加工。少

Size and distance perception of visual object in 3D space was experimentally investigated on human subjects under the situation where vergence angle was the only useful cue for the perception. As an experimental equipment, 3D image projector system and a large (2.5m×2.5m) transparent screen was used. Subjects looked at a visual object on the screen through a liquid crystal binocular shutter. Figures for the right eye and left eye on the screen were switched alternately with the frequency of the binocular shutter. Inter figure separation was changed by a CG computer to present a distance stimulus. The subject manipulated a joy stick to adjust either the size or the distance of a test stimulus in order to reproduce the size or the distance of a memorized reference figure.In the first experiment, the size of the reference dot was memorized by a subject, and then a test dot with a different size and a different distance subsequently presented was readjusted by the subject to fit the memori … More zed size or distance. Accuracy of size reproduction proved to be poor in most of the subjects, while in the small number of the subjects the accuracy of size reproduction was obviously better than the others. Accuracy of distance reproduction also showed wide individual variation. Individual variation of distance reproduction accuracy was highly correlated to that of size reproduction. The fact suggests that the neural network responsible to the size perception is based on the distance cue obtained through vergence eye movement.Accuracy of size reproduction of motion defined edge object was investigated in the second experiment. No obvious difference from the accuracy of ordinary object was observed. Accuracy of size reproduction of motion defined edge proved to be highly correlated to that of distance reproduction. The finding suggests that size perception neural network in the brain process information of both ordinary object and motion defined object after their shape being processed. Less