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- W2048991520 abstract "A target circle surrounded by larger inducer circles looks smaller, and one surrounded by smaller circles looks larger than they really are. This is the Ebbinghaus-Titchener illusion, which remains one of the strongest and most robust of contrast illusions. Although there have been many studies on this illusion in humans, virtually none have addressed how nonhuman animals perceive the same figures. Here the authors show that the Ebbinghaus-Titchener figures also induce a strong illusion in pigeons but, surprisingly, in the other direction; that is, all five successfully trained pigeons judged the target circle surrounded by larger circles to be larger than it really is and vice versa. Further analyses proved that neither the gaps between target and inducer circles nor the cumulative weighted surface of these figural elements could account for the birds' responses. Pigeons are known to show similarities to humans on various cognitive and perceptual tasks including concept formation, short-term memory, and some visual illusions. Our results, taken together with pigeons' previously demonstrated failure at visual completion, provide strong evidence that pigeons may actually experience a visual world too different for us to imagine." @default.
- W2048991520 created "2016-06-24" @default.
- W2048991520 creator A5031078248 @default.
- W2048991520 creator A5058488443 @default.
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- W2048991520 date "2008-01-01" @default.
- W2048991520 modified "2023-10-13" @default.
- W2048991520 title "Pigeons perceive the Ebbinghaus-Titchener circles as an assimilation illusion." @default.
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- W2048991520 doi "https://doi.org/10.1037/0097-7403.34.3.375" @default.
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