Coding, Capacity and Duration of Memory
- Created by: DuNi
- Created on: 10-01-20 18:10
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- Coding Capacity and Duration of Memory
- Research on coding
- Alan Baddley-1966a, 1966b
- 4 groups remember word list
- Group 1: acoustically similar
- Did worst on
- Group 2: Acoustically dissimliar
- Group 3: Semantically similar
- Group 4: Semantically dissimilar
- Did worst on after a 20 min interval
- Group 1: acoustically similar
- Participants asked to recall word list after hearing it
- Info coded semantically in LTM
- Research on capacity
- Digit Span
- Joseph Jacobs 1887
- 4 digit number participant asked to recall in correct order
- If correct moves to 5 digit number until participants get a digit wrong
- Digit mean 9.3
- Letter mean 7.3
- Chunking
- George Miller 1956
- Observed things come in sets of 7
- notes on musical scale
- days in a week
- Grouping sets of digits or letters into units
- Digit Span
- Research on duration
- Duration of STM
- LLoyd and Margret Peterson 1959
- 24 undergrad students
- 8 trails} student given a consonant syllable and three digit number to count back from stop mental rehearsal
- E.G. YCG (a.k.a trigram)
- 8 trails} student given a consonant syllable and three digit number to count back from stop mental rehearsal
- Stopped after different amounts of time to recall what trigram letters were
- Retention interval
- Memory trace disappears sometimes
- Spontaneous decay
- Duration of LTM
- Harry Bahrick 1975
- 392 participants, American state of Ohio, 17-74 years old
- High school year book
- Recall of people in graduating class
- Free recall
- 15 years-60%
- 48 years-30%
- Photo recognition recall
- 15 years-90%
- 48 years-70%
- Duration of STM
- Evalutation
- Artificial stimuli
- Baddeley's study artificial stimuli than meaningful material'
- Word list no personal meaning
- Generalising?
- limited application
- Lacks Validity
- Joseph Jacobs study done ages ago, outdated
- Distraction?
- Confounding varibles
- Not so many chunks
- overestimated amount of chunks only really 4
- Meaningless stimuli
- Peterson and Peterson remembering consonant syllables not real life activites
- External Validity?
- High External validity
- Bahrick high external validity
- Confounding variables? practice over 48 years\?
- Artificial stimuli
- Research on coding
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