Thatcher effect
Optical illusion / From Wikipedia, the free encyclopedia
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"Thatcherization" redirects here. Not to be confused with Thatcherism.
The Thatcher effect or Thatcher illusion is a phenomenon where it becomes more difficult to detect local feature changes in an upside-down face, despite identical changes being obvious in an upright face. It is named after the then British prime minister Margaret Thatcher, on whose photograph the effect was first demonstrated. The effect was originally created in 1980 by Peter Thompson, professor of psychology at the University of York.[1]