Tuesday, February 18, 2014

The Thatcher effect

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 British former Prime Minister Margaret Thatcher on whose photograph the effect has been most famously demonstrated. The effect was originally created by Psychology Professor Peter Thompson in 1980.

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