Duration- Peterson and Peterson- 3 letter Trigram
-Lab experiment of 24 students told a 3 letter trigram e.g. NME
-They were asked to count backwards to stop rehearsal for either 3,6,9,15 or 18 seconds before recalling trigram.
-This was repeated several times using seperate trigrams
-Pp remembered more after 3.
-At 18secs=10% of trigrams remembered
- Informations decays quickly if rehearsal is prevented
Criticisms
All students so cant generalise
Lacks ecological validity as would do in everday life
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