coding, capacity and duration of memory

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  • memory
    • Baddeley (1996) - researched coding
      • limitation - artificial stimuli - shouldn't generalise
    • Long Term Memory
      • capacity - potentially unlimited
      • coding - mainly semantic (meaning)
      • duration - potentially unlimited
    • Short Term Memory
      • capacity - 7 (+ or - 2)
      • coding - mainly acoustic (sounds)
      • duration - between 18 to 30 seconds
    • Jacobs (1887) - capacity of STM
      • limitation - very old study, may lack control BUT later research supports validity
    • Miller (1956) - span and chunking
      • limitation - overestimated capacity. Cowan et al states capacity is around 4 chunks
    • duration of STM - Peterson & Peterson (1959)
      • meaningless stimuli - lacks external validity BUT phone numbers
    • duration of LTM - Bahrick et al (1975)
      • higher in external validity - real life memories studied BUT uncontrolled confounding variables

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