Coding capacity duration

• whats coding


  Format info is stored
• Whats capacity


  Amount that can be stored
• What is duration 


  Length info is stored
• LONG TERM MEMORY


  Coding = semantic

  Capacity = unlimited

  Duration = unlimited
• Short term memory


  Coding= acoustically

  Capacity= 7 +- 2 things

  Duration = 18 seconds
• Sensory register (sense store)


  coding = sense specific

  Capacity = very high

  Duration = very low
• Coding research: badderly word list recall


  4 groups: Acoustic similar+dissimilar and semantic similar +dissimilar

  STM found worse on similar acoustic words so STM is acoustically stored

  LTM found worse on similar semantic words so LTM is semantically stored
• Capacity research: jacobs increasing digits study


  STM found mean length of words is 7.3 letters and for digits its 9.3
• Capacity research: miller observations


  Found pattern of sevens and also chunking is helpful

  STM cap is 7+-2 and LTM unlimited but need prompt
• Duration research: peterson STM count back study


  3 letter + digit recall

  count back from number or letter to prevent rehearsal

  After 3 seconds 80% accurate recall

  After 18 seconds 3% accurate recall
• Duration research: bahrick LTM yearbook recall


  Recall names from pictures

  15 years since graduation 90% accurate recall

  48 years since graduation 70% accurate
• Positive of badderly word list study


  Found difference between stores which led to multi store model
• Negative of badderly word list study


  Artificial material so no personal connection so low application
• Positive of jacobs increasing digit length study 


  Replication of study had same results so high validity
• Negative of millers observation for STM


  Overestimated capacity, its 4 not 7
• Negative of petersons 3 digit recall study


  Artificial material so low application
• Positive of bahricks yearbook recall study


  Meaningful material with personal connection so high validity