Duration of LTM and STM
- Created by: CAugust100
- Created on: 13-05-16 11:22
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- STM and LTM Duration
- Studies
- Peterson and Peterson
- Consonant syllable followed by a three digit number
- Pts had to count back in numbers of 3's or 4's
- 90% recall with 3 second interval
- 2% recall with 18 second interval
- suggests STM lasts 20 seconds without any rehearsal
- Shepard (1967)
- shown 612 memorable pictures
- After an hour there was near perfect recognition
- after 4 months there was 50% recogntion
- Bahrick et al (1975)
- The material to be remembered was more important to the pts
- Thus recall was better
- Peterson and Peterson
- explanation
- STM lasts for around 20 seconds as shown by Peterson & Peterson
- LTM can last between 2 hours and 00 years
- Evaluation
- The duration of the STM may be even shorther
- Marsh et al (1997)
- Pts may not know they have to recall the word, so forgetting could happen as litle as 2 seconds in
- Marsh et al (1997)
- STM may last longer than first thought
- Nairne et al (1999)
- Pts could remember for up to 96 seconds
- Information remains in STM unless other materials replace it
- Nairne et al (1999)
- The duration of the STM may be even shorther
- Studies
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