Short Term Memory (MSM)
- Created by: hlouiset
- Created on: 30-01-16 10:21
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- Short Term Memory
- Capacity
- 7+/-2
- Duration
- 18-30 seconds maximum
- Coding
- Acoustic
- Capacity
- Case Studies
- Jacobs (1887) Digit Span
- The experiment and participant were in a room with no distractions. The experimenter read out digit spans with out chunking them.
- The participants then immediately recall the numbers in the correct order and write them down.
- This repeats, adding a digit after two groups, until the participant can't repeat both groups of the same number of digits.
- The participants then immediately recall the numbers in the correct order and write them down.
- It was found the average amount of digits remembered was around 9 and letters was 7
- It was concluded we can store about 7 (+/- 2) bits of information on out STM
- The environment in which it takes place
- The environment is isolated from real life situations
- This gives the study a low ecological validity
- This could also be an advantage as it makes the results more reliable
- The one on one situation
- The situation could be excessive pressure on the participant
- The experiment and participant were in a room with no distractions. The experimenter read out digit spans with out chunking them.
- Peterson and Peterson (1959) Trigrams
- The aim of this study was to investigate the duration of the STM
- A lab experiment was conducted in which 24 participants had to recall trigrams. To prevent rehearsal participants were given an interference task.
- Participants were asked to recall trigrams after intervals of 3, 6, 9, 12, 15 or 18 secnds.
- It was found that the longer the interval delay the less trigrams were recalled.
- 80% of trigrams after a 3 second delay were recalled
- Less than 10% of trigrams were recalled after a 18 second interval
- It was concluded that STM has a limited duration when rehearsal is prevented
- STM is different from LTM in terms of duration
- It is not a real life situation
- This gives the study a low ecological validity
- It was a laboratory experiment
- Allows us to see the casual effect of time passing on recall
- Conrad (1964) Letter Sequences
- He showed participants a random sequence of six consonants projected rapidly onto a screen.
- Some participants were shown similar consonants that were acoustically similar. Other participants were shown ones that were acoustically dissimilar
- Immediately following participants wrote down the letters in the order shown
- Some participants were shown similar consonants that were acoustically similar. Other participants were shown ones that were acoustically dissimilar
- It was found that participants frequently made errors of recall, more so with acoustically similar consonants
- It was concluded that the STM had converted the visual image to an acoustic code and that the coding resulted in errors in recall
- Other studies have supported the conclusions
- Posner and Kale
- Its too simplistic to conclude all encoding in STM is acoustic
- He showed participants a random sequence of six consonants projected rapidly onto a screen.
- Baddeley (1966) Word Lists
- Participants were shown a list of 20 words and asked to immediately recall what they were
- The words were from catagories that were acoustically similar and acoustically dissimilar as well as semantically similar and semantically dissimilar
- They had to recall the words again after 20 minutes
- The words were from catagories that were acoustically similar and acoustically dissimilar as well as semantically similar and semantically dissimilar
- It was found that words that were acoustically similar were harder to recall
- It was concluded that STM relies on acoustic coding
- STM can also use other forms of coding
- The research was scientific
- Participants were shown a list of 20 words and asked to immediately recall what they were
- Jacobs (1887) Digit Span
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