Joseph Rémi Léopold Delbœuf

Joseph Rémi Léopold Delbœuf (1831-1896) was a Belgian experimental psychologist, hypnotist, mathematician, philosopher, and psychophysicist. He is well known for his Delboeuf illusion, an optical illusion on size perception. Regarding psychophysics, he also experimented on brightness with Gustav Fechner in 1865.

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