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Courtesy of Peter Thompson, from Thompson, P. (1980) Margaret Thatcher: a new Illision. Perception 9 383-4

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Question 1
The Thatcher effect, or the Thatcher illusion, finds that the brain is generally incapable of processing a photograph that
Question 2
In the Thatcher illusion, which facial feature(s) were inverted?
Question 3
The Thatcher illusion provides evidence for the concept of blank vision.