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Heritability in Visual-Geometric Illusions: A Family Study

The Müller–Lyer and Ebbinghaus illusions were tested in 203 mother–father–offspring triads and 303 sibling pairs. Significant familial resemblances were found in all but the overestimated segment of the Ebbinghaus illusion. These results suggest that responses to visual-geometric illusions, mediated by optical or neural interactive mechanisms, show patterns of familial resemblance which may be based upon heritable factors.