Peterson & Peterson (1956)

Peterson & Peterson (1956)

1. Summary

   • Trigram Recall while counting a random number backwards in 3s (e.g. CHJ 506)
     • Find out duration of STM
   • Conclusion
     • Duration of STM without rehearsal is about 18secs

2. Strength

   • Internal Validity
     • Held in a lab making it easier to control
   • Reliability
     • Standardised procedure where it has fixed timings

3. Weakness

   • Ecological Validity
     • Artificial environment meaning it lacks reality
   • Generalisability
     • Unrepresentative sample of only consisting of Psychology students