Psychologist George Sperling's classic experiment demonstrated that:

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Sperling's experiment involved flashing an array of letters for a brief moment and asking participants to recall as many letters as possible. He found that participants were able to recall all the letters if the array was presented for a longer duration but could only recall a fraction of the letters when the duration was shortened. This suggested that the information was held briefly in visual sensory memory for about half a second before being lost.

Psychologist George Sperling's Classic Experiment Demonstrated That