This investigation explores how intermittent lighting affects perceived velocity of radial motion, suggesting optimal conditions for accurate perception.
The velocity of targets approaching directly towards the observer is overestimated when such motion is seen in intermittent illumination.The present investigation aimed at clarifying the conditions leading to such a judgement.The radial motion was simulated by a zoom-lens system in one experiment and by a computer-controlled display in another.In the former the frequency and the velocity domains and in the latter the domain of the on-off ratio of each flash were explored.The flicker rate of 3.5 Hz and the on-off ratio of 80/200 (msec) or less were found optimal for the effect.The range of velocities used, 9 to 42 cm/sec, produced no significant difference.Possible mechanisms for the effect were discussed.
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T. Satoru AIBA (1977) studied this question.
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