Effects of time delay on depth perception via head-motion parallax in virtual environment systems

Experiments were conducted to determine how the ability to detect and discr iminate head-motion parallax depth cues is degraded by time delays between head movement and image update. The stimuli consisted of random-dot pattern s that were programmed to appear as one cycle of a sinusoidal grating when the subject's head moved. The results show that time delay between head mov ement and image update has essentially no effect on the ability to discrimi nate between two such gratings with different depth characteristics when th e delay is less than or equal to roughly 265 ms.