stm capcity
- Created by: Hannah Jeffery
- Created on: 19-12-13 14:58
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- Capacity
- amount of info that can be held in each store
- in STM is limited
- Jacobs 1887
- laboratory experiment
- digit span technique
- participants shown a sequence of digits
- increasing the length of digits in each trial
- half a second between presentation of each digit
- trial ended when participant failed to recall digits
- average recall was 7-/+2
- conclusion: stm capacity between 5 and 9 items
- not determined by the nature of the content but by the size of the STM
- laboratory experiment
- further research by Miller
- can be increased by chunking although the number of chunks is the same (7-/+)
- evaluation
- findings can be applied to everyday life
- eg telephone numbers, post codes and car registrations
- unmeaningful task so lacks mundane realism
- findings can be applied to everyday life
- other factors that affect capacity
- influence of the LTM
- the stm capacity is four chunks any more has been gradually rehearsed and stored in the LTM
- Cowan 2000
- reading aloud
- digit span increases
- Baddeley suggests this because digits are briefly stored in the echoic store
- individual differences
- eg people who highly anxious have a shorter memeory span
- Macleod and Donnellan 1993
- influence of the LTM
- Jacobs 1887
- LTM
- Unlimited capacity
- things are lost though by decay or interference
- Unlimited capacity
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