Word recognition with masking

At illuminances between .07 and 17 ft.-c, the word-recognition threshold was lower when a common word was preceded and followed by a homogenous field than by a noise pattern composed of a random array of bits of letters. Most of the difference is ascribed to the pattern’s interference with post-stimulatory processes. This interference may explain why with masking the threshold reached a minimum at 90 msec. and then did not decrease further despite increasing illuminance, whereas without masking the threshold continued to decrease down to 7 msec, the shortest duration tested.