16+ Thatcher Effect Illusion Pics. From michael's visual phenomena & optical illusions. The thatcher effect was first demonstrated by professor of psychology peter thompson in 1980.

Margaret Thatcher Poster By Andrewgoodman Redbubble from ih1.redbubble.net

Also select merkel as alternative to thatcher. However, recent findings have led to the alternative proposal that the thatcher illusion rests on orientation sensitivity. The illusion is often called the thatcher illusion, because its discoverer, peter thompson2, used a photo of margaret thatcher in his original experiment.

Why does the effect occur?

The thatcher effect or thatcher illusion is a phenomenon where it becomes more difficult to detect local feature changes in an upsidedown face despite ident. Smith said the thatcher effect is a fun illusion to share with your friends. Apply thatcher illusion on a set of face photos. Here are his photos (from this site)