change blindness

 Change blindness is the failure to detect a change in a situation.

A classic study is one by Daniel Simons and Chris Chabris. They asked participants to track the passes of a ball. About half the viewers of the video did not notice the gorilla in the room. Thus, by focusing on the ball, the people were blind to a significant change in the scene.

This concept has also been called inattentional blindness

Reference

Simons, D. J., & Chabris, C. F. (1999). Gorillas in our midst: Sustained inattentional blindness for dynamic events. Perception, 28(9), 1059-1074.

See the gorilla video on YouTube

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