Abstract
Under some conditions, a single pulse of light appears as two. The following parameters of the double-flash phenomenon were studied in two experiments: room illumination, stimulus size, peripheral angle of viewing, latency between the two flashes, and flash wavelength. It was found that the phenomenon only appeared consistently under mesopic levels of white or green illumination and from 13 to 55 deg peripherally. The mean latency between the flashes was estimated at 104 msec. The data are considered to support an explanation in terms of differential latency between the rod and cone systems.
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This study was carried out while the third author was a visitor at the Center for Human Information Processing at the University of California, San Diego. The experiments were supported in part by NIMH Grant MH-15828 to the Center.
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Springer, R.M., Deutsch, J.A. & Stanley, G. Double flashes from single pulses of light. Perception & Psychophysics 18, 398–400 (1975). https://doi.org/10.3758/BF03204111
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DOI: https://doi.org/10.3758/BF03204111