Capacity

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Miller (1956) proposed that the capacity of short-term memory is around seven 'items', plus or minus two.
Miller suggested that short-term memory stores 'chunks' of information, rather than individual numbers or letters.
The immediate digit span is supported by Jacobs (1887) who found that participants had an average span of 7.3 letters and 9.3 words.
Peterson & Peterson (1959) conducted a laboratory experiment to investigate the duration of short-term memory. Peterson & Peterson had 24 psychology students recalling three-letter trigrams at different intervals (3, 6, 9, 12, 15, or 18 seconds) while counting backwards.

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Capacity

Cards (4)

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5.3 Capacity Utilization

1.1.2 Structures of Memory

2.2.1 Short-Term Memory

2. Memory

2.3 Introduction to Memory

3.2.2 Specific Heat Capacity

2.1 Memory Models

2.4 Theories of Memory

2.2 Features of Memory

5.3 Research Studies in Memory