Abstract
This study investigated masking of letters by a bright flash of light or by a pattern. The results showed that (a) masking by flash is primarily a monoptic effect; masking by pattern occurs under monoptic and dichoptic conditions; (b) increasing the interstimulus interval decreases masking by pattern less than by monoptically presented flash; (c) repetition of trials decreases masking by pattern but not by flash. Different processes are involved when flashes and patterns are used as masking stimuli.

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