Abstract
Metacontrast and paracontrast were examined under a wide range of luminances and interstimulus intervals. Results show monotonic masking functions for both metacontrast and paracontrast. Luminance affected the detectability of targets and was shown to have small but significant effects on the extent, but not on the nature, of metacontrast and paracontrast functions.
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Lefton, L. A. Metacontrast: High-frequency square-wave gratings are difficult to mask. Paper presented at the meetings of the Psychonomic Society, November 7, 1975, Denver, Colorado.
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This research was supported by a grant from the National Eye Council, National Institutes of Health to L. Lefton (1 ROI EY 01201 -@#@ 02). No official endorsement of NEI should be inferred. We thank Jack Griffin for help in data collection and analysis.
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Lefton, L.A., Newman, Y. Metacontrast and paracontrast: Both photopic and scotopic luminance levels yield monotones. Bull. Psychon. Soc. 8, 435–438 (1976). https://doi.org/10.3758/BF03335191
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DOI: https://doi.org/10.3758/BF03335191