Abstract
THE well-known spiral after-effect can be generated by looking for some time at a rotating, apparently contracting spiral. When the spiral is stopped it appears to expand outwards. It appears that both rods and cones are able to mediate this effect: Wohlgemuth1 observed the effect in both the light-adapted and the dark-adapted eye, and also in the foveal and peripheral retina. The dark-adapted and peripheral effects, presumably mediated by the rods, are brisker but briefer than the light-adapted and foveal effects mediated by the cones.
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References
Wohlgemuth, A., Brit. J. Psychol., Mon. Suppl. 1 (1911).
Granit, R., Brit. J. Psychol., 19, 147 (1928).
Grindley, G. C., J. Physiol., 69, 53 (1930).
Anstis, S. M., Nature, 201, 952 (1964).
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ANSTIS, S. Generation of a Spiral After-effect by Interaction of Rods and Cones. Nature 206, 1069–1070 (1965). https://doi.org/10.1038/2061069b0
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DOI: https://doi.org/10.1038/2061069b0
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