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Life-Span Ontogeny of the Parallel-Lines Illusion

The magnitude of two assimilative and one contrastive version of the parallel-lines illusion was measured using 72 observers whose ages ranged in years from the teens to the seventies. Only the overestimated assimilative illusion varied significantly with age, producing smaller misestimations in both youth and old age and a maximal distortion in the 50s. This quadratic trend duplicated the adult-age course of the overestimated Müller-Lyer illusion thereby reinforcing the belief that the two are kindred visual anomalies. As with the Müller-Lyer, the ontogeny of the parallel-lines illusion is best explained by age-induced changes in the vigor of contour interactions.