Psychophysical properties of displacement thresholds for moving targets.

Psychophysical movement displacement thresholds were determined for three stimulus parameters (line length, stimulus luminance, and duration of movement) at various locations in the visual field. Although some differences were noted, foveal and peripheral movement displacement threshold functions were generally similar when scaled and plotted on logarithmic coordinates. The findings were consistent with known physiological and anatomical properties of retina, and suggest that retinal mechanisms are an important determinant of motion displacement threshold.