· Present or immediate part memories
· Will decay if not rehearsed
· Miller (1956) Limited capacity of 7+- 2
· Maintenance rehearsal allows transfer to LTM
· Usually acoustic
· Peterson and Peterson (1959) 90% recall after 3 seconds, 2% after 18 showing when prevented from rehearsing, STM is poor
· Jacobs (1887) 9.3 items for numbers, 7.3 for letters
· Cowan (2001) more likely to be 4 rather than 7
· Baddeley (1996a/b) acoustically similar words get confused in the STM whereas semantically similar ones do in the LTM showing different encoding processes
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