Method: Ppts shown nonsense trigrams (CVM). Asked to recall after either 3, 6, 9, 12, 15, 18 secs. During pause, asked to count backwards in 3s from given number (interference task)
Results: After 3 secs : 80% correct recall
After 18 secs 10% correct recall
Conclusion: When rehearsal prevented, little stays in STM longer than 18 secs
Evaluation: Reliable. Lab experiment, variables controlled.
Nonsense trigrams artificial. Lacks ecological validity.
Meaningful / real life memories may last longer. Duration depends on stimulus
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