Editing Pulfrich effect (section)

==Explanation==
The widely accepted explanation of the apparent depth is that a reduction in retinal illumination (relative to the fellow eye) yields a corresponding delay in signal transmission, imparting instantaneous spatial disparity in moving objects. This seems to occur because visual system latencies are generally shorter (i.e., the visual system responds more quickly) for bright targets as compared to dim targets. This motion with depth is the visual system's solution to a moving target when a difference in retinal illuminance, and hence a difference in signal latencies, exists between the two eyes.

The Pulfrich effect has typically been measured under full field conditions with dark targets on a bright background, and yields about a 15 ms delay for a factor of ten difference in average retinal illuminance.<ref name="Lit, 1949">Lit A. (1949) The magnitude of the Pulfrich stereo-phenomenon as a function of binocular differences of intensity at various levels of illumination. ''Am. J. Psychol.'' 62:159-181.</ref><ref name = "Rodgers & Anstis, 1971">Rogers B.J. Anstis S.M. (1972) Intensity versus Adaptation and the Pulfrich Stereophenomenon ''Vision Res.'' 12:909-928.</ref><ref name = "Williams & Lit, 1983">Williams JM, Lit A. (1983) Luminance-dependent visual latency for the Hess effect, the Pulfrich effect, and simple reaction time. Vision Res. 23(2):171-9.</ref><ref name = "Deihl, 1991">Deihl Rolf R. (1991) Measurement of Interocular delays with Dynamic Random-Dot stereograms. Eur. Arch. Psychiatry Clin. Neurosci. 241:115-118.</ref>  These delays increase monotonically with decreased luminance over a wide (> 6 log-units) range of luminance.<ref name="Lit, 1949"/><ref name="Rodgers & Anstis, 1971"/> The effect is also seen with bright targets on a black background and exhibits the same luminance-to-latency relationship.