Peterson and Peterson

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Aim
To test the duration of STM.
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Procedure
Participants were given a nonsense 'trigram' of three syllables, together with a three-digit number. To prevent rehearsal, they had to count backwards in threes from the number until told to stop after either 3, 6, 9, 12, 15, or 18 seconds. After the inte
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Findings
Recall was generally accurate after 3 seconds (over 80%), but by 18 seconds it declined to around 10%.
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Conclusions
It was concluded that the duration of STM is around 18-30 seconds, if rehearsal is prevented.
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Evaluation
(Weakness)
Used artificial and meaningless stimuli. This is a weakness because it does not reflect how memory works in everyday life, so they lack external validity.
5 of 5

Other cards in this set

Card 2

Front

Procedure

Back

Participants were given a nonsense 'trigram' of three syllables, together with a three-digit number. To prevent rehearsal, they had to count backwards in threes from the number until told to stop after either 3, 6, 9, 12, 15, or 18 seconds. After the inte

Card 3

Front

Findings

Back

Preview of the front of card 3

Card 4

Front

Conclusions

Back

Preview of the front of card 4

Card 5

Front

Evaluation
(Weakness)

Back

Preview of the front of card 5

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