visual masking

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A reduction or elimination of the detectability of a brief (shorter than 100 milliseconds) visual stimulus called the test stimulus by the presentation of a second stimulus called the masking stimulus either before the test stimulus (forward masking), at the same time as the test stimulus (simultaneous masking), or after the test stimulus (backward masking). When the test stimulus and masking stimulus do not overlap spatially, forward masking is called paracontrast and backward masking is called metacontrast. The term was introduced in 1925 by the French experimental psychologist Henri Piéron (1881–1964). See also brightness masking, central masking, dichoptic masking, inspection time, masking, Perky phenomenon.

Subjects: Psychology.

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