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Measurements of chromatic and achromatic afterimages

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Abstract

Several types of measurement were made of the negative afterimages formed by viewing chromatic and achromatic sine-wave conditioning gratings that were stabilized on the retina. We varied the spatial frequency, contrast, and duration of the conditioning stimulus and the interval between its offset and the after-image measurement. Different methods of measuring afterimage contrast were also compared. We conclude that (1) an isoluminant chromatic stimulus creates an isoluminant chromatic afterimage; (2) afterimage contrast is linearly related to conditioning contrast; (3) chromatic and achromatic afterimages have similar low-pass spatial-frequency characteristics; (4) both types of afterimage build up and decay exponentially, with a (1/e) time constant of 4–8 s; (5) most important, both chromatic and achromatic afterimages raise the threshold for a chromatic flashed grating, but neither affects the threshold for an achromatic flashed grating; (6) we can explain these results by postulating that negative afterimages are subserved only by the sustained, or parvocellular, pathways.

© 1993 Optical Society of America

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