Duration of STM

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Duration of STM
Peterson and Peterson
1 of 15
Trigrams
PPTS were shown trigrams then asked to count backwards in 3s from large numbers in different amounts of time intervals
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Counting backwards
acts as a distracter task to prevent rehersal of trigrams
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Peterson and Peterson found that
approximatly 80% of trigrams were recalled correctly after 3 seconds of counting
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fell to fewer than 10%
being recalled correctly after 18 seconds of counting
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Peterson and Peterson concluded that duration of STM is very short (20s)
shown by PPTS lack of repeating the information
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Maintance rehersal
is nessasary to prevent the information being lost
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STM information is lost through
decay if maintance rehersal is prevented (counting backwards)
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Cannot seperate the effects of decay due to
short duration of STM and displacement due to small capacity of STM
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Other factors that can affect the capacity of STM:
Reading aloud, PPTS read digits alloud before attempting to recall
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reading aloud
performance of PPTS was better when simply read them without speaking (subvocally)
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Rythmic grouping:
performance improves if numbers are rhythmically grouped together eg phone numbers
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Other factors that can influence LTM
difficulties in using immediate digit span as a measure of STM capacity
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Bower and Winzenz found
digit strings that are repeated within a series of immediate memory span trials became progressivly easier for PPTS to recall
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Indicating infomation stored in LTM
is helping to increase STM capacity temporarily, difficult to exclude the influence of LTM
15 of 15

Other cards in this set

Card 2

Front

PPTS were shown trigrams then asked to count backwards in 3s from large numbers in different amounts of time intervals

Back

Trigrams

Card 3

Front

acts as a distracter task to prevent rehersal of trigrams

Back

Preview of the back of card 3

Card 4

Front

approximatly 80% of trigrams were recalled correctly after 3 seconds of counting

Back

Preview of the back of card 4

Card 5

Front

being recalled correctly after 18 seconds of counting

Back

Preview of the back of card 5
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