Apparent motion was investigated under light-adapted condition approximate to the standard viewing condition of television. Two 2°×2° square patterns were presented on monochromatic CRT display with a variety of spatial separation (SS) and stimulus onset asynchrony (SOA). Though the results of evaluation varied somewhat from subject to subject, good motion impressions were common to the subjects at a restricted range of SS (less than about 2°) and of SOA (less than about 100 msec). Exposure duration of the pattern had produced little effect on the evaluation. Explanation was given to these results on the basis of retinal receptive field model.
