Cite as:
Daneyko O, Zavagno D, Zanuttini L, 2011, "Lightness effects in Delboeuf and Ebbinghaus size-contrast illusions" Perception 40(4) 464 – 473
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Lightness effects in Delboeuf and Ebbinghaus size-contrast illusions

Olga Daneyko, Daniele Zavagno, Lucia Zanuttini

Received 26 November 2009, in revised form 17 April 2011

Abstract. We examined lightness effects observed in Delboeuf and Ebbinghaus size-contrast illusions. Results of four experiments are reported. Experiment 1 was conducted with Delboeuf-like stimuli and shows that the disk that appears bigger appears either lighter or darker than the disk that appears smaller, depending on the contrast polarity between disks and background. Experiment 2 shows that the direction of these lightness effects is not influenced by the luminance of the size-contrast inducers. Experiment 3 shows that a similar lightness effect is also observed in modified Ebbinghaus size-contrast displays. Experiment 4 tested the presence of the size-contrast illusion in the stimuli used in experiments 2 and 3.

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