Memory Flashcards
(39 cards)
Coding
-format which information is stored
-STM encoded acoustically (way it sounds)
-LTM encoded semantically (what it means)
Coding research
-Baddeley, 4 groups of Ps with list of words
- acoustically similar/dis
-Semantically similar/dis
-When asked to recall straight away acoustically sim did worst, suggests its encoded acoustically in
STM,acoustic confusion, gets confused muddles them up
- when asked to recall after 20 min semantically sim did worst
- suggests info is encoded semantically in LTM
- semantic confusion, gets confused by similar meanings
Evaluate coding
- Strength;
- research often done in labs
- Baddeley could manipulate variables like noise level, suggests we can be confident in coding of STM is acoustic and LTM semantic
- has high internal validity as we can ensure manipulation of our IV caused our DV - Strength;
- provided there is evidence between stores
-It’s stood the test of time
-Paved the way for understanding
-Led to creation of the multi store model - Weakness
-artificial stimuli
-Words have no personal meaning
-Doesn’t tell us about coding in different memory tasks
-Can’t apply to real world
Capacity and research
-how much info can be stored
Jacobs developed digit span
-Four digits and asked to recall in order
- done again with five and so on until cannot continue
-found average span for numbers is 9.3
-7.3 for letters
- 8 yr olds could recall 7 digits but by 19 could recall 9
-how many evidence capacity of STM is between 5 to 9 items
Miller
- grouped words (chunking) e.g AFU
- found people could recall 7+- 2 new pieces of info
Capacity evaluation
Strength; jacobs
- been replicated and confirmed by other studies
-suggests it’s stood the test of time and increases validity
Weakness;miller
-overestimated STM capacity
- other research suggests 4+/-1 chunks
-suggests lower end of millers estimate is more appropriate
Duration research
- period of time info can last in stores
-STM is 18-30 seconds LTM could be up to a lifetime
Peterson and Peterson
-nonsense Trigram (GZH) - and 3 digit number
- asked to recall trigram after interval of 3,6,9,12,15 or 18 secs
- and asked or count backwards from 3 digit number to prevent rehearsal
- 3- 80% recall. 18-10% recall
Bahrick et al
-investigated VLTM
-studied Ps from America aged 17-24
-high school year book obtained
1.photo recognition test-to name as many individuals from 50 yb photos
90% accurate after 15 years and 70% accurate after 48 years
2.free recall test- recall names from individuals in yearbook with no cues
60% accurate after 15yrs and 30% accurate after 48yrs
-suggests LTM has long duration
Duration evaluation
Strength: Bharick
-high external validity and generalisable
-used meaningful memories
-reflect real estimate of duration if LTM
Weakness; artificial stimuli
- p and p asked them to remember nonsense trigrams
- stimuli didn’t reflect real life memory activities
- lacks internal validity
Multi store model of memory
Atkinson and shiffrin
LTM, STM and sensory register
-each store has diff coding capacity and duration
- STM and LTM are unitary stores
-rehearsal needed to pass STM-LTM
- Info passes from one store to next on linear fashion
Sensory (MSM)
-info arrives through senses, 5 stores
- iconic memory (visual)
- echoic (auditory)
- constantly receiving info
-info remains in store from brief period
- large capacity
-info transferred into STM
Short term memory (MSM)
-limited capacity
- capacity is 7+/-2
-coded acoustically and lasts 30 secs
- maintenance rehearsal when we repeat material over and over again, if we rehears long enough is passes to LTM
Long term memory (MSM)
-events that have happened in distant past
- permanent store
- capacity is unlimited
- tends to be coded semantically
- when we want to recall info it has to be transferred back to STM by retrieval
Evaluation of (MSM)
Strength: supported by wide Range of research
- baddelys list of words study
-acoustically sim hard to recall straight away
- semantically sim hard to recall after 20 min
-shows 2 types of memory are different entities
Weakness; despite support we form memories of useful things
- many studies use digits and letters which have no meaning
- may not be accurate to how it works in every day lives
- low external validity
Weakness: states STM is unitary store, amnesia evidence suggests it’s inaccurate
- patient KFs memory was damaged
- couldn’t recall numbers read out to him but visual info was unaffected
- suggests there is two different stores for auditory and visual information
- weakness as it questions the accuracy of (MSM)
Episodic memory (LTM)
-personal events or experiences
-time stamped
Semantic memory (LTM)
-facts or general knowledge
-less personal
-not time stamped
Procedural memory (LTM)
-Motor skills/ actions
-not time stamped
(LTM) evaluation
Strength;
-evidence from case studies, amnesia
- Clive Wearing, episodic memory Severely damaged but semantic and procedural unaffected
-suggests there are different memory stores in LTM as one can be damaged and other unaffected
-provides evidence there are different types
Strength; evidence from brain scans
- tulving et al asked Ps to perform tasks while scanning brain, found semantic memories involved at left pre frontal cortex whilst episodic at right
- suggests that diff ares of brain are involved in diff types of LTM
-provides evidence that these types of memories are diff but also stored in diff parts of the brain
Weakness; research conducted on individual patients
- Clive and HM are isolated cases of individual LTM damage
-suggests it’s inappropriate to assume everyone’s LTM is formed the same way as 2people who suffered brain damage
-cannot be generalised beyond the research done so knowledge is still sparse pm LTM
Working memory model
-Baddely and hitch argued WMM was too simple
-stemmed from dual task experiments
-replaces idea of STM being a unitary store
Central executive
-main component (boss)
-controls attention
-control over three components
-no storage capacity and only pay attention to limited number of stimuli
Phonological loop
- auditory information
- preserves order of information
-limited capacity
Phonological store: holds info in speech based form
Articulatory control system: maintenance rehearsal
Visuo-spatial sketchpad
-stores and manipulated visual/ spatial info
-can access LTM and retrieve Visio-spatial info
-limited capacity
Visual cache : stores info
Inner scribe: records spatial relations
Episodic buffer
-general store
-integrates info from other areas
-storage component of CE
-limited capacity of 4 chunks
Evaluation of WMM
+ patients with brain damage
KF suffered brain damage, could only remember few digits when read allowed but no issues when reading
Suggests phonological loop was damaged
Supports because provides real life evidence there are separate stores for visual and auditory
+dual task
Baddely asked Ps to track light and image in block letters (2 visual)
Then asked to track light while completing verbal task
Did significantly better
Suggest two visual tasks were harder cause they both compete for the same salve system where the other task has no competition
Strength as it shows there are separate salve systems
-central executive vague
Only know it’s the boss and divides attention
Suggests further research must be done do us to full understand WMM
Weakness as it questions the usefulness of one of the main parts of model
Interference Theory
-forgetting is due to interference
-proactive: old info affects new
-retroactive:new affects old info
Proactive research
-Keppel+underwood
-replicating Peterson and Peterson nonsense trigrams
-found Ps remembered the ones they learned first compared to last
-supports as it shows the trigrams first affected the learning of new ones