Visual perceptive simultaneity and masking of letters successively presented

Abstract

Two sets of letters S1 and S2 when presented successively are perceived as simultaneous if the total duration of time from the beginning of S1 to the end of S2 is kert constant, whatever the duration of S1, S2, or the interval. The same law applies in the case of dots arranged to form geometrical figures. On the other hand, the phenomena of meta-contrast with letters are modified when the relative duration of S1, S2, and the interval vary. Thus perceptive integration and masking depend upon different processes.