Abstract: The influence of various phase differences from 0 to 180 degrees on the discrimination of two intermittent light signals and their effect upon apparent movement were studied experimentally. Results revealed that the influence varied with different combinations of frequency, colour and position of the flash signals. The conditions for the occurrence of apparent movement with intermittent lights found in this experiment differed from some of former studies. This suggested that the use of intermittent lights with phase differences might be a new approach to the investigation of the problem of apparent movement. It was further indicated that under all combinations of frequency, colour, position, phase differences and coding as used in this experiment, two closely located intermittent lights should not be used simultaneously as signals.

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