Abstract
McCOLLOUGH1 first reported that following prolonged inspection of vertical gratings on orange backgrounds successively alternating with horizontal gratings on blue backgrounds, the vertical stripes in an achromatic test pattern will appear greenish and the horizontal stripes will appear pink. Because the effect was evidently related to the orientation of the grids on the retina, McCollough hypothesized that it was due to adaptation or fatiguing of colour- and orientation-specific edge detectors in the visual system. But recent studies2–4 employing two grids of varying spatial frequency but with the same orientation have demonstrated similar chromatic after-effects on achromatic test patterns of the same orientation.
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