A classic experiment by psychologist George Sperling demonstrated that:

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George Sperling's experiment demonstrated that information in visual sensory memory is held for about half a second before it decays. Sperling presented participants with a grid of letters for a very brief amount of time, and then asked them to recall as many letters as they could. When participants were asked to recall all of the letters, they could only remember a few. However, when a tone was played immediately after the letters disappeared to cue participants to remember only a specific row of letters, they were able to recall almost all of the letters in that row, indicating that the information was briefly held in sensory memory but decayed quickly.

A Classic Experiment by Psychologist George Sperling Demonstrated That