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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.
22 Σεπ 2023 · Humans are typically much worse at processing information in faces that are presented upside down rather than right-side up. This phenomenon is known as the face inversion effect.
The Thatcher illusion demonstrates a degree of independence between the processing of facial identity and facial expression. The identity of a Thatcherized face can be recognized when the face is upside down, albeit with some difficulty, whereas the ability to perceive the grotesque facial expression is completely lost.
30 Σεπ 2020 · The Thatcher Effect is a phenomenon where it’s hard to identify localized changes in the features of an upside-down face, while the same changes are immediately obvious in the upright position.
When a face is shown upside down, the brain can’t really use its same mechanisms but instead will look at the individual features and process them as they are. By all accounts, they tend to look correct (As they would if the face was not upside down), so nothing seems odd at all.
15 Φεβ 2016 · The Margaret Thatcher Illusion — which also gets called the Thatcher Effect, along with other names — occurs when a picture is turned upside down. But instead of changing everything in the...
The face inversion effect (FIE) is defined as the larger decrease in recognition performance for faces than for other mono-oriented objects when they are presented upside down. Behavioral studies suggest the FIE takes place at the perceptual encoding stage and is mainly due to the decrease in ability to extract relational information when ...
