Abstract
Asch and Witkin showed that when an observer adjusted a bar on the far wall of a miniature room tilted at 22° laterally, the apparent vertical of the bar was displaced about 10°–14° in the direction of room tilt1. We report here an experiment which shows that earlier exposure to a similarly tilted room produces the same direction of change in apparent verticality when a luminous bar is adjusted in darkness. This experiment included appropriate controls for the occurrence of a spatial after-effect2,3, and so the data suggest that illusory effects persist after the conditions inducing them are removed.
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References
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Austin, M., thesis, Univ. Sydney (1967).
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AUSTIN, M., SINGER, G. & DAY, R. Visual Orientation Illusion following Judgments with a Tilted Visual Field. Nature 221, 583–584 (1969). https://doi.org/10.1038/221583a0
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DOI: https://doi.org/10.1038/221583a0
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