Abstract
The literature on the interaction of two successive identical subliminal flashes in determining the light detection threshold is reviewed. Four empirical equations, collectively termed the TEpee effect, give a good description of the data of several studies. The TEpee effect describes detection data obtained with several background luminances, with a variety of flash durations, with different colors, with decrements as well as with increments (flashes), and with both monocular and binocular viewing. The TEpee effect also describes detection data obtained with multiple identical flashes, with two electrical pulses (phosphene threshold), with response latency measures, with critical flicker frequency, and, possibly, with the interaction of two supraliminal flashes. The TEpee effect is limited to identical flashes presented foveally. It does not describe the interaction of nonidentical flashes, nor does it describe the interaction of flashes in the peripheral retina.
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An erratum to this article is available at http://dx.doi.org/10.3758/BF03203245.
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Herrick, R.M. Foveal light-detection thresholds with two temporally spaced flashes: A review. Perception & Psychophysics 15, 361–367 (1974). https://doi.org/10.3758/BF03213959
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DOI: https://doi.org/10.3758/BF03213959