エビングハウス錯視における大きさ対比の構造的要因

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  • Structural factors of size contrast in the Ebbinghaus illusion

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Size contrast was studied in the Ebbinghaus illusion with inducing circles (ICs) that were either larger or smaller than the central test circle (TC). Four ICs formed either squares or diamonds; or in a mixed-size condition four large ICs alternated with four small ICs. Figures were presented on printed cards and studied as a function of IC-TC distance, or displayed on a computer screen at various angles of orientation. A separate circle, presented left or right of an Ebbinghaus figure and varying in size, served for simultaneous comparision. A general overestimation was found for figures presented right from the comparison circle. Size contrast diminished with increasing IC-TC distance for small ICs, but increased for large ICs. Square arrays had stronger inducing effects than diamonds with small ICs, but weaker with large ICs: the mixed-size condition resulted in a small underestimation. Furthermore, size contrast depended systematically on the angle of IC-array orientation. The Ebbinghaus illusion thus obeys structural factors in a rather peculiar way, suggesting the necessity of a compound model of size contrast.

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