Memory- STM, LTM and duration
- Created by: CiaraBaker
- Created on: 08-04-15 15:53
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- Memory
- Duration of STM
- A measure of long a memory lasts before it is no longer available
- Peterson and Peterson (1959)
- 24 students
- consonant syllable followed by 3 digit number (eg WRT 303)
- After hearing the syllable and number- had to count backwards from this number in 3s or 4s
- Participants were given practice trials- then 8 trials
- On each trial the retention interval was different
- (Time spent counting backwards)
- (e.g 3,6,9,12,15,18 seconds)
- Participants remembered about 90% with a 3 second interval.
- 2% with an 18 second interval
- When rehearsal is prevented, STM lasts about 20 seconds max
- 2% with an 18 second interval
- On each trial the retention interval was different
- Participants were given practice trials- then 8 trials
- After hearing the syllable and number- had to count backwards from this number in 3s or 4s
- consonant syllable followed by 3 digit number (eg WRT 303)
- 24 students
- Duration of LTM
- Shepard (1967)
- 612 pictures
- Hour later, shown pictures again with others- almost perfect recognition
- 50% recognised after four months
- Hour later, shown pictures again with others- almost perfect recognition
- 612 pictures
- Bahrick et al (1975)
- Names to faces inYear books
- 48 years on -70% accurate
- Names to faces inYear books
- Shepard (1967)
- Evaluation
- Marsh et al (1997)
- when participants do not expect to be tested after this interval, forgetting may occur after just 2 seconds.
- Nairne et al (1999)
- Items could be recalled as long as 96 seconds
- Information remains in STM for quite a while unless other material replaces it or overwrites it.
- Items could be recalled as long as 96 seconds
- Marsh et al (1997)
- Duration of STM
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