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Differences in the magnitude of the Delboeuf Illusion and Usnadze Effect during adulthood


, : Differences in the magnitude of the Delboeuf Illusion and Usnadze Effect during adulthood. Journal of Gerontology 34(2): 229-233

The Delboeuf illusion (type I) and Usnadze Effect (type II) were used to investigate changes in perceptual processes in 72 female subjects, aged 20-79 yr. Unlike other studies, small figures (less than 2.degree.) were presented for brief exposure periods under fixation conditions. The magnitude of the Delboeuf illusion increased in old age. The magnitude of the Usnadze Effect showed no change.

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Accession: 005151373

PMID: 438476

DOI: 10.1093/geronj/34.2.229

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