Whenever you think about illusions, names of magicians such as HarryHoudini and David Copperfield probably come to mind. However, in thevisual system, illusions are often evidence of how the perceptual system“changes” what was actually detected by the sensory system.

Experience teaches us to expect certainperceptual relationships among stimuli. Illusions often take advantageof these expectations.

Access the CogLab demonstration “Müller-Lyer” and follow the instructions to complete the demonstration.

Based on the demonstration, respond to the following:

Write your initial response in 300–500 words. A

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