Ebbinghaus illusion

a size contrast illusion in which a concentric ring of large circles makes a medium-sized circle in the center of the ring look small, whereas the same circle in the center of a ring of smaller circles looks large. Also called Titchener circles; Titchener illusion. [introduced in the 1890s by Hermann Ebbinghaus but sometimes incorrectly attributed to Edward Bradford Titchener]

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Psychology term of the day

February 16th 2025

Association for the Advancement of Psychology (AAP)

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