Ebbinghaus Illusion (IMAGE)

Wellcome Trust

Ebbinghaus Illusion

Caption

The Ebbinghaus illusion. Most people will see the first circle as smaller than the second one Researchers found a strong link between the surface area of the primary visual cortex and the extent to which volunteers perceived the size illusion -- the smaller the area, the more pronounced the visual illusion.

Credit

Dr Samuel Schwarzkopf, UCL

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