Facts about Sperling Sensory Memory
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Iconic memory's visual resolution is estimated at approximately 1 million bits per second, vastly exceeding the 16 bits per second that can be transferred to short-term memory through the attentional bottleneck.
- 10
Sperling's experiments used a 4x3 grid of letters presented for 50 milliseconds, demonstrating that sensory memory stores visual information at a much higher resolution than conscious awareness can access.
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The partial report paradigm revealed that iconic memory contains more information than people can verbally express, demonstrating a critical distinction between storage capacity and reportable memory.
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Participants in Sperling's experiments showed dramatically better performance when a tone cue indicated which row to report, proving that all information was briefly available even though only a small portion could be consciously accessed and reported.
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Backward masking experiments building on Sperling's work showed that a second visual stimulus presented 50 to 100 milliseconds after the first can erase iconic memory traces before they transfer to short-term storage.
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Sperling's research revealed that people can only name three to four items from briefly flashed visual displays without a cue, compared to five or more with immediate partial report cues.
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Decay of iconic memory occurs within 250 to 500 milliseconds without attention, making Sperling's sensory memory findings crucial for understanding why unattended visual information vanishes so rapidly.
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Approximately 500 milliseconds of processing time allows iconic memory to be encoded into visual short-term memory, extending retention beyond the initial sensory stage.
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Visual sensory memory requires attention to be transferred into short-term memory, otherwise the information decays regardless of storage capacity in iconic memory.
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George Sperling's participants could accurately report four to five items from a briefly displayed grid, but only when cued immediately, revealing the severe capacity limits of iconic memory storage.
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In 1960, George Sperling demonstrated that visual sensory memory persists for approximately 250 milliseconds using his partial report paradigm experiment.