Patterson R, Ricker C, McGary J, Rose D
Washington State University, Pullman 99164.
Vision Res. 1992 Jan;32(1):149-56. doi: 10.1016/0042-6989(92)90122-y.
This study investigated the ability of human observers to discriminate the direction of laterally-moving cyclopean stimuli, in order to assess some of the properties of stereoscopic mechanisms that mediate the perception of cyclopean motion (motion existing at levels of binocular integration). The stimuli were moving grating patterns created from dynamic random-dot stereograms. Experiment 1 showed that duration thresholds for discrimination decrease with velocity; they are not governed by temporal frequency nor a constant spatial displacement. Experiment 2 revealed that discrimination thresholds increase with disparity magnitude, for both the crossed and uncrossed disparity directions equally. Experiment 3 showed that the rate of temporal variation at and above which direction discrimination fails (cyclopean upper limit of temporal resolution) is 8 Hz. Our results indicate that a mechanism for motion perception exists at binocular-integration levels of the visual system, which supports a model of motion perception that posits the existence of first-order and second-order processes.
本研究调查了人类观察者辨别横向移动的双眼单视刺激方向的能力，以便评估一些介导双眼单视运动（存在于双眼整合水平的运动）感知的立体视觉机制的特性。刺激物是由动态随机点立体图创建的移动光栅图案。实验1表明，辨别持续时间阈值随速度降低；它们不受时间频率或恒定空间位移的支配。实验2表明，对于交叉和非交叉视差方向，辨别阈值均随视差大小增加。实验3表明，方向辨别失败时及以上的时间变化率（双眼单视时间分辨率上限）为8赫兹。我们的结果表明，视觉系统的双眼整合水平存在运动感知机制，这支持了一种假定存在一阶和二阶过程的运动感知模型。
