Key Study: The MSM - Glanzer & Cunitz (1966)
Aim: To investigate serial position effect as evidence for there being two separate stores of memory (STM and LTM) which supports the Multi-Store Model of Memory
Participants: 46 males who were all enlisted in the US army
Procedure: Each participant was individually shown 15 lists each containing 15 words. There were three conditions of the independent variable:
- Immediate recall after being shown the list
- Recall after a 10-second interference task (the Brown-Peterson technique of counting backwards aloud from a given number in threes)
- Recall after a 30-second interference task (the Brown-Peterson technique of counting backwards aloud from a given number in threes)
Results:
- Participants in the immediate recall condition showed the expected ‘U’ curve of the serial position effect - i.e. more items recalled from the beginning and the end of the list, showing both primacy and recency effect
- Participants in the 10-second delay condition showed a similar primacy effect to the immediate recall group but much less of a recency effect
- In the 30-second delay condition the primacy effect was high but the recency effect had disappeared with fewest items recalled from the end of the list compared to the other two conditions.
Conclusion: By preventing rehearsal with a 30-second interference task, items from the end of the list had not been rehearsed in STM so they could not be transferred to LTM and so the recency effect is prevented. In other words, there appear to be two separate storage facilities for STM and LTM.
Evaluation of Glanzer & Cunitz (1966)
Strengths
- This is a well-controlled lab experiment with standardised procedure which makes it replicable thus high in reliability
- The dependent variable was measured quantitatively which means that the results are easy to compare and to analyse statistically
Limitations
- The procedure lacks ecological validity due to the artificial nature of the task
- The use of an independent measures design could give rise to participant variables i.e. one condition of the IV could have consisted of people whose memory was naturally better than in the other groups
Key terms:
- Serial position effect
- Primacy effect
- Recency effect