MEMORY - The Multi-Store Model (MSM)
- Created by: EmilyEther
- Created on: 06-01-19 13:33
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- The Multi-Store Model (MSM)
- Definitions
- MSM: an explanation of memory that see info flowing through a series of storage systems
- SENSORY REGISTER (SR) - a short-duration store holding impressions of info received by the senses
- SHORT-TERM MEMORY (STM) - a temporary holding store holding small amounts of info for long periods of time
- LONG-TERM MEMORY (LTM) - a permanent store holding limitless amounts of info for long periods of time
- CODING - the means by which info is represented in memory
- CAPACITY - the amount of info that can be stored in memory
- DURATION - the length of time info remains within storage
- CHUNKING - method to increase capacity in STM by grouping info into large units
- Sensory Register
- CODING
- info stored in raw. unprocessed form
- separate sensory stores for each of the senses
- info that is paid attention to passes to STM. Remainder fades quickly, leaving no lasting impression
- CROWDER ('93) - info is retained in iconic store for few milliseconds 2-3 secs in echoic store. Supports ides of separated coding and duration for different sensory info
- sensory memory may consist of sub-stores eg. visual persistence and info persistence within iconic store
- CAPACITY
- very large as all info is in unprocessed, highly detailed and ever-changing format
- SPERLING ('60) - 3x4 grid of letters on screen for 1/20th of a sec. Different tones (high, med or low) for each line to recall. Recall of rows = high. Suggests all info was there - capacity of SR = huge
- calculating capacity involves PPs evaluating cues -> suggests change in random wave patterns. These only provide estimates and are highly artificial. Lack mundane realism
- evidence that iconic store can hold 15-20 images. Other stores not well studied - so brief and occur at pre-conscious level
- DURATION
- limited duration
- duration of each store = not consistent
- duration decreases with age
- WALSH & THOMPSON ('78) - iconic sensory store has average of 500 milliseconds, decreases as individs get older
- evolutionary perspective: people need to focus on perceptual info with survival value
- CODING
- STM
- CODING
- info arrives from SR in raw form and encoded in easier form in STM (visually, acoustically, semantically)
- See BADDELEY ('66) research
- research shows encoding in STM is mainly acoustic, but other stores (visual) are used too
- CAPACITY
- limited capacity (5-9 items)
- can be increased by chunking eg. SOSABCITV into SOS/ABC/ITV
- JACOBS (1887) - serial digit span method. PPs must recall increasingly bigger lists of numbers (eg. 8, 3, 6, 4) in right order. When they fail 50% of time = capacity reached. Total cap for numbers = 9, letter = 7. Recalling lists - lack mundane realism
- other factors (age & practice) influence STM capacity
- limitations of STM mostly seen as due to limitations during processing associated with attention
- DURATION
- max of 30 secs
- can be improved with rehearsal. If done long enough - will go into LTM and be more long-lasting
- PETERSON & PETERSON ('59) - nonsense trigrams (ZFG). PPs counted back in 3s from 100 and recalled non.tri. 90% recalled correctly after 3 secs, 5% after 18 secs. STM duration around 20-30 secs.
- BUT different trigrams on each round may have led to interference between tasks
- brief duration may be due to displacement - new info comes into STM and pushes out existing info due to limited cap
- little research evidence considering the STM duration of other forms of stimuli (visual images)
- CODING
- LTM
- CODING
- coding of info will be stronger (memory = more retrievable)
- verbal info -> mainly semantic but other stores are also present
- NELSON & ROTHBART ('72) - PPs made errors when recalling homophones (night and knight). Suggests LTM has several varieties
- smells and tastes can't be coded semantically and song are encoded acoustically = different stores in LTM
- diff types of LTM involve diff brain areas - encoded in different ways in LTM
- CAPACITY
- unlimited. Info may be lost due to interference and decay, but not lack of capacity
- WAGENAAR ('86) - created diary of 2,400 and tested himself on events instead of dates. His recall was very good -> suggests large cap for LTM
- assumed to be limitless -> research can't determine a finite cap
- evolutionary basis to LTM: FAGOT & COOK - pigeons can hold 1,200 picture response associations. Baboons hadn't reached cap after 3 yrs training, memorising 5,000 associations. Survival value -> natural selection
- DURATION
- depends on individs lifespan
- the better coded info is, the longer the duration
- longer duration for skills over facts
- BAHRICK ('75) - 400 PPs 17-74 had set of names and photos of ex-school friends. Those who'd left school 15 yrs prior identified 90% of faces & names. Those left 48 yrs prior identified 80% of names and 70% of faces.
- info never lost in LTM, it is just a problem of access
- testing techniques may effect findings. Recognition of stimuli is better than free recall
- CODING
- Definitions
- Research
- Evaluation (A03)
- General info
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