memory

  • Created by: mozy
  • Created on: 15-03-19 08:48
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  • the nature of memory
    • the sensory register
      • coding -- sensory
        • haptic- tactile
        • iconic- visual
        • gustatory- taste
        • echoic -auditory
        • olfactory-smell
      • capacity-- unknown but very large
      • duration --very limited aprox. 250ms
    • short term memory
      • coding -- acoustic
        • baddeley-word lists, acoustically similar and dissimilar,
          • ppts had to recall words in correct order
          • found 10% recall of similar words
            • acoustic confusion, concludes LTM is coded acoustically
      • capacity- 7-9 items
        • jacobs- digit span test
          • read a series of numbers and ppts had to repeat them in the right order
            • found on average that someone could remember an average of 7+/-2
              • concluded LTM had limited capacity
        • miller-chuncking
          • supports research of Jacobs
            • found that LTM capacity could be increased by chuncking
      • duration -18-30 seconds
        • peterson and perterson-lab experiment using random trigrams made of constants
          • count back in 3s from a 3-digit number to prevent rehearsal
            • found- after 3 seconds recall was aprox. 80%, after 6 seconds decreased to 50% and after 18 seconds fell to 10%
              • conclude that info in the LTM was lost quickly when there was no time to rehearse it
    • long term memory
      • coding -- sematic
        • baddeley- word list - semantically similar and dissimilar
      • capacity -- unlimited
        • we often forget due to interferance or retrival failure
      • duration-- unlimited
        • bahrick - school photographs
          • free recall from a list of names, a photo recognition and a name recognition
            • found that after 15yrs recognition of names and faces fell to 90%the to 80% after 48yrs
              • concluded that recognition was better than recall
            • free recall of names was a 60% at 15yrs and 30% at 48yrs

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