Coding capacity and duration of memory

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  • Created by: floberry1
  • Created on: 04-05-17 19:21
What is coding?
coding is the process of converting information from one form into another
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What is one study into coding?
Baddeley. memory recall of 4 different categories of words after different time intervals (immediately & after 20 mins)
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what were the 4 categories in baddeleys study?
acoustically similar, acoustically dissimilar. semantically similar, semantically dissimilar
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what were the findings of Baddeleys study?
stm candidates did worse with acoustically similar words. ltm candidates did worse with semantically similar words
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what does this suggest?
that LTM is coded semantically.
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what is one limitation of Baddeleys study?
it used an artificial stimulus and therefore had limited application to real life situations and results are hard to generalise.
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who did a study on the capacity of STM?
Jacobs
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what was the procedure of the study?
Digit span - asked people to recall a number of digits in the correct order
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what were the findings of the study?
jacobs found that the mean number of digits that people could recall was 9.3. it was slightly lower for letters
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what is the evaluation for jacobs study?
the study was performed a long time ago when there were less strict controls on such experiments. therefore there were confounding variables reducing the internal validy.
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which psychologist developed the idea of 'chunking'?
Miller
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what was his theory?
everything comes in 7's. therefore he thought the capacity of STM was also 5-9. he also noted b]people could recall 5 words as easily as 5 letters
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who studied the duration of LTM
Bahrick
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briefly outline Bahricks procedure into duration of LTM
he asked ex pupils from a school (17-74) to recall the names of their old class mates either by photo recognition or free recall.
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what were the findings?
those who had left within 15 years recalled the names 90% accurately on photo recognition & 60% free recall. those who left more that 15 years ago - 70% photo recognition & 30% free recall.
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what is a limitation of Bahricks study?
it had confounding variables in that the participants may have looked at the yearbook recently.
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what is a strength of the study?
it has good external validity because it is real life application. i.e a real life situation regarding something that means something to the participant
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which study looked at the duration of STM
Peterson&peterson's trigram recall test.
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what was the procedure of the study?
ppts were shown a trigram e.g. YGH and then asked to count down from a large number. they were stopped at different amounts of time and tested on their recall.
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why were they asked to count down from a number?
to prevent rehearsal of the trigram
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what were the findings?
the longer the amount of time - the poorer the memory recall.
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what is the evaluation of this study?
again, limited application because it is an artificial stimulus that meant nothing to the ppt. therefore low external validity.
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What is one study into coding?

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Baddeley. memory recall of 4 different categories of words after different time intervals (immediately & after 20 mins)

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what were the 4 categories in baddeleys study?

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what were the findings of Baddeleys study?

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what does this suggest?

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