Evaluation of coding, capacity and duration (P2)

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  • Evaluation of coding, capacity and duration
    • S: Bahrick's study has high external validity
      • Real life, meaningful memories were studied (peoples faces)
      • Produced higher, more accurate results than lab studies
      • However, confounding variables are not controlled, for example, pupils looking through their year book to remember the faces
    • L: Baddeley didnt use meaningful material
      • The words used in the study had no meaning to the Pp
      • When processing more meaningful material, people use semantic coding even for STM tasks
      • Means that the results of the study have meaningless application and results are not generalisable
    • L: Jacobs study was conducted a long time ago
      • Early research often lacked adequate control of extraneous variables
        • E.g. some Pp may have been distracted whilst learning and therefore do not perform as well
      • Results are not valid due to confounding variables that were not controlled
      • However, other research has come to the same conclusion, making his research valid
    • L: Miller's study may have overestimated the capacity of STM
      • Cowan reviewed other research and concluded that it was only 4 chunks
      • Suggests 5 items is more probable than 7
    • L: Peterson and Peterson's study uses an artificial stimulus
      • Remembering constant syllables does not represent anything in real life
        • Can be argued that the study lacks ecological validity
        • However, we do sometimes try and remember 'pointless' things, such as phone numbers


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