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The echo of a sound which did not produce an echo, but which the brain hears after the sound was made because it replays sounds the individual just heard in order to help that individual comprehend it better. Imagined echoes are the auditory equivalent of the images the eyes continue to see though the still image they saw is no longer visible. That scientifically proven phenomenon is called the "persistence of vision," and makes it possible for the 30 still images motion picture projectors display one after the other to create the optical illusion the brain interprets as continuous movement.
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