Duration of STM 0.0 / 5 ? PsychologyMemoryASAQA Created by: franpepper21Created on: 19-04-16 14:21 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 2 of 15 Counting backwards acts as a distracter task to prevent rehersal of trigrams 3 of 15 Peterson and Peterson found that approximatly 80% of trigrams were recalled correctly after 3 seconds of counting 4 of 15 fell to fewer than 10% being recalled correctly after 18 seconds of counting 5 of 15 Peterson and Peterson concluded that duration of STM is very short (20s) shown by PPTS lack of repeating the information 6 of 15 Maintance rehersal is nessasary to prevent the information being lost 7 of 15 STM information is lost through decay if maintance rehersal is prevented (counting backwards) 8 of 15 Cannot seperate the effects of decay due to short duration of STM and displacement due to small capacity of STM 9 of 15 Other factors that can affect the capacity of STM: Reading aloud, PPTS read digits alloud before attempting to recall 10 of 15 reading aloud performance of PPTS was better when simply read them without speaking (subvocally) 11 of 15 Rythmic grouping: performance improves if numbers are rhythmically grouped together eg phone numbers 12 of 15 Other factors that can influence LTM difficulties in using immediate digit span as a measure of STM capacity 13 of 15 Bower and Winzenz found digit strings that are repeated within a series of immediate memory span trials became progressivly easier for PPTS to recall 14 of 15 Indicating infomation stored in LTM is helping to increase STM capacity temporarily, difficult to exclude the influence of LTM 15 of 15
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