Participants in Simons and Levin's (1998) study did not notice when a person asking them for directions was switched with another person. This illustrates ______.

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This phenomenon is known as change blindness, which occurs when a change in a visual stimulus is introduced and the observer does not notice it. In Simons and Levin's study, participants were focused on giving directions and failed to notice the switch, illustrating how people can be blind to significant changes in their visual field when their attention is directed elsewhere.

Participants in Simons and Levin's (1998) Study Did Not Notice