Memory Stores Studies List

List of memory studies, including study and evaluation

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Bahrick (1975) Duration of LTM

Negative:

Difficult to control factors affecting memories of individuals eg. wheather people were still in contact with each other after school.

Memory duration could be affected by old age

Positive:

High ecological validity - real test of memories in people's lives

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Miller Capacity of LTM

Low ecological validity as it was done as a lab experiment and the test was not relevent to real life. No-one would ask to use a serial digit span

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Baddeley et al (1975) STM Capacity word-length eff

Expands on Miller's findings - particularly when Baddley controled 'familiarity' of words. Initial experiment - people recalled short words (wit, sum) because they were more familiar

Excellent lab condition control - presented words on screen - meant it was word leanght, not reading speed that changed

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Peterson and Peterson (1959) Duration of STM

Low ecological validity - people don't have to remember nonsense trigrams in real life. Indifference from previous caused poor recall

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Baddeley (1966) Encoding in STM

55% acoustically similar words remembered, 75% dissimilar

Low ecological validity. Evidence in other studies that STM may use other forms of encoding

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Baddeley Encoding in LTM

Recall worse for semantically similar words (30% less accurate than senantically dissimilar) concludes LTM is stored semantically

Only LTM words tested (semantic memory) Other types of LTM: memory for past events (episodic) or how to ride a bike (procedural) might use different types of encoding

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