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心理物理试验是研究立体视觉的主要方法。70年代VEP开始用于体视研究,并取得许多结果。由于VEP信号复杂,这些结果不能令人满意。本文使用心理物理试验和VEP对比方法对体视加以研究。我们的结果是:VEP波形中第一个正峰与刺激图形的亮度有关;N_2峰和P_3峰的潜伏期对判断体视存在与否有重要价值;本试验确定N_2峰潜伏期在体视存在时约为240ms—280ms,无体视存在时约为290ms—310ms;P_3峰潜伏期在体视存在时约为280ms—310ms,无体视存在时约为340ms—360ms;体视存在时的VEP与无体视存在时的VEP的互相关系数小于0.1;有体视的VEP其功率谱密度在8Hz附近有一峰;心理物理试验中使用强制选择得到的结果从VEP波形比较中可以确认是可靠的;有体视的VEP其N_2和P_3的潜伏期随视差变化呈现规律性改变。
Psychophysical testing is the main method of studying stereoscopic vision. VEP began to be used in stereoscopic studies in the 1970s and achieved many results. These results are unsatisfactory due to the complexity of the VEP signal. This article uses psychophysical tests and VEP contrast method to study stereoscopy. Our results are: the first positive peak in the VEP waveform is related to the intensity of the stimulus pattern; the latency of N 2 peak and P 3 peak is of great value in judging the presence or absence of stereopsis; in this experiment, Is 240ms-280ms, there is about 290ms-310ms when there is no stereopsis; peak latency of P_3 is about 280ms-310ms when there is stereomy, and about 340ms-360ms when there is no stereopsis; The cross-correlation coefficient of VEP as it exists is less than 0.1; the power spectrum density of stereopsis VEP has a peak around 8 Hz; the results obtained by forced selection in psychophysical experiments can be confirmed as reliable from the VEP waveform comparison; Visual VEP of its N_2 and P_3 latency showed a regular change with changes in parallax.