Peterson and Peterson's Research

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Peterson and Peterson (1959) 

Aims;

Investigate the duration of the Short-Term memory 

Procedures;

participants were shown non-sense trigrams (3 letter words) and had to recall them after 3,6,9,12,15 or 18 seconds. During the pause they were asked to count backwards in 3's from a given number- This was the interference task- it prevents rehersal. 

Finding;

After 3

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