Playground
Mueller-Lyer Illusion
Perceptual length illusion bias
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Instructions
Mueller-Lyer Illusion
You will see two horizontal lines with different arrowhead patterns.
Your task is to decide which central line looks longer, even when they are physically similar.
Response Keys
[F] Left Longer
[J] Right Longer
Starts with a short practice round that is not scored.
Total trials: 20
Example