Menory - duration of STM and LTM by Peterson and Peterson and Benrick

  • Created by: Besme
  • Created on: 31-05-18 13:27
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  • Memory
    • Duration, capacity and coding
      • Duration on STM by Peterson x 2
        • Tested 24 who took part in 8 trials, were given a consonant syllable to remember and 3 digits numbers. Were asked to count the 3 digits backwards to prevent any mental rehearsal. Students were told to stop at different time period (retention interval)
          • Suggests that STM has a very short duration unless repeated over and over
        • Duration on LTM by Banrick
          • studies 392 participates, high school yearbooks were taken from the partcipiate or directly from some schools. LTM was tested in various ways.
            • 1) Photo-recognition tests consisting of 50 photos
            • 2) Free-recall test where participates recall all the names of their graduating class
            • Participates tested within 15 years of graduation were 90% accurate in photo recognition. After 48 years to 70%
            • Free-recall 15 years - 60% accurate dropping to 50% after 48 years
        • Evaluation
          • A weakness of the research into the duration of STM is the use of a meaningless stimuli. Participates in Petersons study were told to remember consonant which do not reflect real-life memory, which would be more meaningless. Therefore, most research into STM would lack external valility
            • On the other hand, research into LTM would have greater external validity as participates re menorising meaningful memories. The level of meaningful memories were studies as LTM with meaningless pictures had lower recall. However, some may conduct that confounding variables were not controlled such as participates looked at the yearbooks and rehearsal their memories.
              • Another weakness of research into duration of STM and LTM is the criticism towards Peterson and Peterson, who offered an alternative explanation towards forgetting in STM. Researchers believed that memories are displaced when not rehearsed. This is because their is a limited capacity and new information will push out current information.


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