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Effects of steady inducer and test duration on threshold

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Abstract

Threshold energy for a test flash was determined (with three subjects) in the presence of an adjacent steady inducer. The purpose was to investigate the effects of different test durations on the inducer’s ability to raise threshold. Changes of test duration from 12.5 to 1000 ms were found to account for a 60% increase of inducer effectiveness at the closest test–inducer separation (8.6′). Increases of separation to 190′ produced decrements of this test-duration effect. These results bear on questions concerned with test duration as a variable of perceived contrast and possible underlying mechanisms.

© 1974 Optical Society of America

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