交替呈现随机点立体图对的时间特性

利用微机化的伪随机点立体图对发生器进行双眼体视的心理物理实验,研究交替呈现的随机点体图对(RDS)在达到双眼融合形成立体感知时信息输入的时间特性.实验结果表明,当RDS的交变频率达到4.8Hz以上时就能达到双眼的信息融合产生立体感知,但当交变频率低于62.5Hz时有图形的闪烁感.当交变频率等于62.5Hz时则产生稳定而清晰的立体感知.一幅RDS图对中的L(左)和R(右)图的呈现时间及其之间的交变时间的长短均对双眼的融合和立体感的形成有影响.L和R图的呈现时间和交变时间还存在一定的关系,以立体感形成为条件,如增大一定值的L和R图的呈现时间,则它们之间的交变时间必须相应减小,反之亦然.实验结果提示,双眼立体感知的形成不涉及单眼图象的长时记忆和短时记忆,仅有瞬时的视觉存储.

TEMPORAL CHARACTERISTICS OF STEREOSCOPIC PERCEPTION OF ALTERNATELY CHANGING RANDOM-DOT STEREOGRAM

The temporal characteristics ot delayed display ot two halt stereoscopic pictures to either of two eyes was studied. Three sets of psychophysical experiments were conducted. The results indicate that the frequency of alternately presenting RDS (RDS: Random-Dot Stereogram) half pictures to two eyes must be over 4.8 Hz, if stereoscopic perception could be produced.As frequency between two half stereoscopic pictrues presenting to each of two eyes was from 4.8 to 62.5 Hz, stereoscopic perception could be produced but with scintillation, when the frequency was equal 62.5 Hz, a clear perception of form in depth could be produced without scintillation.Both the alternately time between left and right image present and the time of DL and DR affect the binocular fusion and stereopeses.In order to keep the stereoscpic perception, the alternately delayed time of left and right images have to decrease if displaying time for left and right image increase.The results suggest that neither long-term memory nor short-term memory is involved in the processing of stereopsis.