MEMORY Flashcards
Multi-store model of memory, working memory model, long term memory, explanations of forgetting (interference, retrieval failure), misleading information
Multi-store model of memory
Atkinson and Shiffrin
sensory –> short term –> long term
attention, rehearsal x2, retrieval
encoding
how information processed into memory
capacity
amount of information that can be stored
duration
how long information is stored in memory store before it is forgotten
sensory memory
information obtained from senses
constantly receiving information, more than can be processed
info registered based on sense
visual
auditory
touch
smell
taste
iconic memory
echoic
haptic
olfactory
gustatory
sensory memory
encoding
processed and registered based on its sense within specific region
sensory memory
capacity
very large
all sensory experience
sensory memory
duration
1/4 - 1/2 a second
most info decays unless attention paid, then transferred to short term
sensory memory research evidence
existence
Sperling
4x3 matrix of letters for 0.05 seconds and asked to recall all letters
ppts recalled 4-5 letters and reported seeing more
suggests ppts processed whole of matrix but info quickly decays and is forgotten
sensory memory research evidence
existence
capacity, duration
Sperling variation
same matrix but gives a specific sound after seeing the matrix to prompt them to recall a specific row only
could recall 3-4 letters from whichever row cued
processed whole of matrix since can recall most of letters from which row they were called on (high capacity)
unable to recall all (low duration)
can’t pay attention as do not know which row before
sensory memory research evidence
duration
Treisman
presented identical auditory messages to both ears with slight delay
able to notice messages were identical if delay was <2 seconds
duration of echoic sensory register is 2 secs
sensory memory research evidence
duration, different sensory stores
Crowder
only retains info in iconic memory for a few milliseconds
info in echoic for 2-3 seconds
supports duration of <2 seconds
different senses coded in different ways
multi-modal
short term memory
pay attention to info in sensory memory, pass to short term
forgetting due to displacement (newer info displaces older as not enough room in STM)
retained through rehearsal and transferred to LTM
short term memory capacity
7+/-2 items
short term memory duration
approx. 18-30 seconds
can be extended through maintenance rehearsal (repetition)
info remains in STM or passed into LTM
short term memory encoding
acoustically
short term memory research evidence
capacity
Miller
presented with list of numbers and recalled in sequence
list increases until no longer to recall correctly
could recall 7+/-2 numbers (5-9)
chunking - item does not refer to individual letters or numbers but chunks of information
short term memory research evidence
duration
Peterson and Peterson
ppts recalled trigrams (meaningless three-consonant syllables) presented one at a time
had to be recalled after intervals of 3, 6, 9, 12, 15 or 18 seconds
asked to count backwards in 3s or 4s from specified random number until red light appeared and had to recall trigram (prevent rehearsal)
longer they had to count backwards, less accurate recall
after 3 secs, 80% recalled correctly
after 6 secs, 50%
after 18 secs, less than 10%
STM has limited duration when rehearsal prevented
short term memory research evidence
encoding
Baddeley
ppts presented with 4 lists of different words
- acoustically similar
- acoustically dissimilar (control)
- semantically similar
- semantically dissimilar (control)
recalled as many as possible in serial order
worse at recalling acoustically similar words - encoding is acoustic
long term memory
info needs to rehearsed significantly in STM to be transferred to LTM
long term memory duration
potentially unlimited
long term memory encoding
semantically
long term memory capacity
unlimited
long term memory research evidence
duration
Bahrick
uni graduates shown photos from high school yearbook and asked to select name that matched photo
90% able to correctly match names and photos 14 years after graduating
60% after 47 years
potentially unlimited duration
long term memory research evidence
encoding
Baddeley
word sequences presented 4 times
ppts spent 20 mins on interference task (STM –> LTM)
asked to recall word list in serial order
harder to recall semantic list in initial phase
–> STM acoustic (semantically similar harder to encode)
recall during retest –> semantically similar easier
–> LTM is semantic
STM and LTM affected differently, different types of encoding
multi-store model of memory strengths
supporting evidence
supporting evidence for 3 separate stores
Miller found ppts could recall 5-9 numbers, as list increased, ppts were no longer able to recall correctly
Baddeley found ppts could recall acoustically similar words initially, but after 20 mins, semantically similar words easier to recall
STM and LTM are different stores
- lacks mundane realism
unnatural tasks e.g. random lists, not indicative of how memory operates irl, unnatural behaviour
+ Bahrick has high task validity
graduates asked to match names to photos in yearbook
multi-store model of memory strengths
supporting case study evidence
high validity
HM suffered from epilepsy, medial temporal lobe and hippocampus removed
seizures stopped, LTM damaged
could recall normal 7 items but could not extend via rehearsal
3 separate stores, info passing is linear
- does not account for Clive Wearing
damage to hippocampus, severe amnesia
STM damaged, cannot hold info for more than 7 seconds (avg = 18-30)
LTM intact for specific info - play piano, cannot remember children
cannot explain how LTM partially impaired, may be multiple memory stores
questions whether linear - STM damaged, LTM intact
multi-store model of memory strengths
practical applications
importance of rehearsal in forming LTM and passing info
advice given to students about consolidating material or revising that rehearsal is significant
LTM can decay if not revisited
improve revision process
multi-store model of memory weaknesses
contradicting evidence
rehearsal does not need to occur for STM –> LTM
‘flash-bulb memories’ - vivid, long-lasting memory of shocking event
info passed straight to LTM, often retrieved without rehearsal
questions necessity of rehearsal
more research needed
working memory model
Baddeley and Hitch
sensory
central executive, visuo-spatial sketchpad, phonological loop (phonological store and articulatory control)
long
working memory model assumptions
focuses on short term memory
multi-component
central executive
supervisory function - controls PL and VSS
decides which info to attend to or ignore
limited capacity
process info from any sense
vague and untestable
cannot falsify
phonological loop
controlled by central executive
written and spoken material
divided into phonological store and articulatory process
phonological store
‘inner ear’
stores info in speech based form
duration of up to 2 secs, after which it decays
can be retained if rehearsal in articulatory process
articulatory process
‘inner voice’
rehearses info verbally
capacity of what can be rehearsed in 2 secs
converts written –> verbal, then transferred to PS
visuo-spatial sketchpad
controlled by central executive
responsible for visual and spatial info
info received from eyes and held in LTM
divided into visual info in the visual cache
and spatial info in inner scribe
episodic buffer
added in 2000
temporary storage system controlled by central executive
responsible for chunking info from VSS and PL into detailed single object/event that can be transferred to LTM
working memory model
research evidence (dual-task)
dual-task technique
- 2 tasks at the same time
- if tasks require use of the same system they cannot be performed successfully together (limited capacity)
- if they use different systems, both performed successfully together and separately
working memory model strengths
research evidence (Baddeley)
dual-task technique using VSS
track point of light moving around a screen and mentally classify angles of letter F
could perform both separately well but when done together, performance at both impaired
if did one at the same time as a verbal task, as good at visual as when performing alone
indicates other systems which work in different ways - certain tasks cannot be performed at the same time
working memory model
research evidence (patient KF)
brain damage, functioned normally but STM severely impaired
could only recall 1 or 2 items rather than 7
forgot faster when received auditorily than visually
had normal STM span for meaningful sounds but words, letters and digits was limited
working memory model strengths
research evidence (Paulesu)
PET scan to record brain activity while performing verbal tasks (PL) or visual tasks (VSS)
different areas of brain were active
- verbal (frontal)
- visual (parietal)
indicates sub-systems
working memory model strengths
practical applications
understanding and supporting people with Alzheimer’s
patients can use VSS and PL independently but have impaired function when used in conjunction
suggests issue with central executive (coordinates diff systems)
teaches people to simplify and not overwhelm
working memory model weaknesses
methodological problems
research support lacks validity
tasks lack mundane realism - unnatural environment and tasks
behaviour produced not valid and generalisable to memory in the real world
working memory model weaknesses
unscientific
details on CE are vague and limited
no info on capacity, role in attention and whether one or more systems
not measured or testable, lacks falsifiability
episodic buffer added to address failure to explain chunking and linking PL and VSS
working memory model weaknesses
contradicting research
cannot explain different types of memory e.g. musical memory
Bertz used dual-task technique using multiple acoustic tasks (PL), could listen to instrumental music without impaired performance on other acoustic tasks
contradicts dual-task (not limited capacity)
contradicts WMM
long term memory
Tulving
declarative (conscious recall)
episodic / semantic
non-declarative (unconscious recall)
procedural
long term memory assumptions
not a single store, split into 2 categories
declarative recalled consciously
- ability to think, explain and describe info with language
- involves some conscious effort - info brought to mind and ‘declared’
non-declarative recalled unconsciously
- abilities and skills expressed through performance
episodic memory
memories of personal life events / experiences
declarative - info needs to be consciously brought to mind
hippocampus and temporal lobe
reference to time and place
easy to forget as become jumbled
semantic memory
memories of meaningful / factual info
declarative - info needs to be consciously brought to mind
hippocampus and temporal lobe
don’t remember when memory acquired
more difficult to forget than episodic but not as much as procedural
procedural memory
memories of motor skills, actions, muscle memory
non-declarative - not consciously aware memorising or recollecting anything
basal ganglia and cerebellum
automatic and unconscious
resistant to forgetting
long term memory strengths
research support
(Clive Wearing)
Clive Wearing, damaged hippocampus, severe amnesia
- STM severely impaired (info decays after 7 seconds)
- LTM intact - can still read, play piano, no memory of children
supports 3 types of LTM (episodic damaged, procedural intact)
long term memory strengths
research support
(HM)
able to develop skill of tracing shape with memory over many days but had no memory of having done it before
procedural intact (muscle memory retained skill) and recalled unconsciously but episodic damaged