Lages Martin, Mamassian Pascal, Graf Erich W
Department of Psychology, University of Glasgow, 58 Hillhead Street, Glasgow, G12 8QB Scotland, UK.
Vision Res. 2003 Dec;43(27):2861-73. doi: 10.1016/j.visres.2003.08.006.
We used the Pulfrich effect to investigate perception of motion in depth. Independent manipulation of spatial and temporal frequency content in stereoscopic motion stimuli revealed the tuning characteristics of motion-in-depth perception. Sensitivity to interocular phase difference between sinusoidally oscillating sine-wave gratings was measured in four observers who judged direction of motion in depth. Discrimination thresholds in terms of interocular phase difference were determined to investigate spatial and temporal tuning characteristics of a system that is based on interocular phase difference, interocular delay, binocular disparity and velocity difference. Temporal frequency tuning of interocular phase difference thresholds was band pass and relatively dependent on spatial frequency variation. These results together with evidence from two control experiments support the idea that sensitivity to direction of motion in depth is limited by a stereo-motion system that monitors binocular horizontal disparity and motion rather than interocular phase difference, interocular delay, or interocular velocity difference.
我们利用普尔弗里希效应来研究深度运动感知。对立体运动刺激中空间和时间频率内容的独立操控揭示了深度运动感知的调谐特性。在四名判断深度运动方向的观察者中，测量了正弦振荡正弦波光栅之间的双眼相位差敏感度。确定了以双眼相位差、双眼延迟、双眼视差和速度差为基础的系统的空间和时间调谐特性的辨别阈值。双眼相位差阈值的时间频率调谐呈带通特性，且相对依赖于空间频率变化。这些结果与两个对照实验的证据共同支持了这样一种观点，即深度运动方向的敏感度受到一个监测双眼水平视差和运动而非双眼相位差、双眼延迟或双眼速度差的立体运动系统的限制。
