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Peterson and Peterson 1959

1. M- lab ex

   • strength: scientific method- controlled extraneous variables (blocking rehearsal by counting back in 3s thus internal V-high
     • strength: lab ex - high reliability -replicated.
       • furthermore, study bee replicated 100s of time- finding STM does have limited durations- high reliability.
         • Limitation- controlled environment- artificial setting- not true to life.
           • thus lacks eco v
             • furthermore, meaningless trigrams - not true to life test of memory- Task V-low

2. G- 24 P's - small sample.

   • university students- don't generalize to wider population.

3. A- Trace decay- info lost.

   • interference - counting back in 3s compete the trigrams for limited capacity in STM.

4. A- inform students- interference in STM - music while revising competes with info.

   • Music while revising- info not go to LTM.