Types of Memory

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  • Types of Memory
    • Long term memory LTM
      • Duration
        • No Limit - Lifetime
        • Harry Bahrick (1975)
          • 400 people tested on their memory of classmates ans shown 50 images of classmates
          • From a photo 15 y's= 90% 48 y's=70%
          • Free recall  15 y's=60% 48 y's=30%
      • Capacity
        • No Limit
      • Encoding
        • Semantic (meaning)
        • Baddeley (1966)
          • He used a word list to test the effects of acoustic and semantically similar words on LTM
      • Types of LTM
        • Episodic
        • Semantic
        • Procedural
    • Short term memory STM
      • Duration
        • 18 seconds
        • Peterson and Peterson (1959)
          • 24 students given three consonants and three numbers to remember
          • Recall after 3,6,9,12,15,18 seconds
          • 3s=90% 9s=20% 18s=2%
      • Capacity
        • George Miller (1956)
          • He came up with the "magic number 7"
        • 7+/- 2 bits if info
        • Joseph Jacobs (1887)
          • The maximum is 9.3 digits and 7.3 letters
      • Encoding
        • Acoustically (sound)
        • Baddeley (1966)
          • He used a word list to test the effects of acoustic and semantically similar words on STM

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