Abstract
WE wish to report an effect we noticed accidentally while observing the parallel grid figure of Gregory's book Eye and Brain1 (Fig. 1). When the page was stationary only the vertical grid would be seen; but during rapid to and fro, left to right movement the fins of the Müller–Lyer figure became visible. The latter happened to be on the reverse side of the page (136). Holding the page so that the grid was horizontal did not make possible the observation of the Müller–Lyer figure either when stationary or with left to right movement—although it could be seen during up and down movement.
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References
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WADE, N., SANFORD, A. Visual Contour Masking. Nature 231, 124–125 (1971). https://doi.org/10.1038/231124a0
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DOI: https://doi.org/10.1038/231124a0
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