memory as
dd
- Created by: Lucy O'Byrne
- Created on: 20-03-12 19:07
MEMORY
ENCODING: changing present information into a different form.e.g. short term= repeated/ rehearsed= acoustic coding, in terms of their sound
Long term- in terms of its meaning, semantic coding
DIFFERENT FORMS: visual, auditory, semantic, taste, smell
CAPACITY: short term very limited capacity, 7ish items. Long term, so large it cannot be filled, unlimited capacity
DURATION:information lasts longer in long term store. If not rehearsed in STM can dissapear in 18 seconds
STORAGE: as a result of encoding, information is stored in memory system, can be stored for a lifetime
RETRIEVAL:Recovering information can be known as recall or remembering
CAPACITY IN STM: JACOBS
AIMS: investigate how much information can be held in STM
- need accurate measure of STM capacity- serial digit span
PROCEDURES:- lab experiment using the digit span technique
- P'S presented with a sequence of letters or digits, had to repeat sequence in same order it was presented, pace of item was half second intervals. Repeated several times to establish participants digit span
FINDINGS: average STM span was between 5 and 9 items
-STM increased with age
CONCLUSIONS: - STM had a limited storage capacity
-not determined by nature of the item but by size
-STM span increasing was due to increasing brain capacity or improved memory techniques
EVALUATION OF JACOBS
POSITIVE: great historical importance, first systematic attempt
NEGATIVE:
-lacks mundane realism, not representative of everyday memory. May make results biased. Data wasn't meaningful
-means STM could be higher for everyday memory
-cannot be generalised for real life memory, low ecological validity (but if they used more meaningful things, could be stored in LTM?)
POSITIVE: have been used to go on and improve memory
ENCODING IN STM (CONRAD)
AIMS: test acoustic hypothesis
PROCEDURE: compared performance of acoustically and visually presented data
- p's presented with 6 letters at a time for 0.75 seconds
- recall letters in order shown
EVAL: - showed visual codes do exist in STM
DURATION OF STM- PETERSON AND PETERSON
DURATION OF STM- PETERSON AND PETERSON
AIMS: -study how long info remains in STM, using simple stimuli, not allowing participants to rehearse
- wanted to see if stuff that wasn't rehearsed was lost from STM instantly
PROCEDURE: used "brown-peterson" technique, used a trigam to look at consonants, had to recall in correct order after a delay of 3,6,9 etc seconds...to prevent rehearsal they had to count backwards
FINDINGS: after 3 seconds, 80% recalled
- 6 seconds 50%
-18, fewer than 10%
CONCLUSIONS: information held in STM is rapidly lost when there's no opportunity for rehearsal
EVALUATION OF PETERSON AND PETERSON
-Used artificial stimuli, V little meaning, which means it lacks mundane realism and external validity
- given many trails with different trigams, confusing
-only considered STM duration for one type of stimulus
POSITIVE: well controlled lab experiment, allows cause and effect
-repeated measures design
BAHRICK ET AL- DURATION IN LONG TERM MEMORY
AIMS: aimed to investigate during of very long term memory, see if it really can last a lifetime
-test for real life information
PROCEDURE: 329 american students. opportunity sample
-free recall of as many students names they could remember, photo recognition test, name recognition test, name and photo matching test.
-results compared with high school year books
FINDINGS: 90% accurate in face and name
CONCLUSIONS: classmates were rarely forgotten once given recognition clues. LTM was supported. Finding that free recall was only 30& after 48 years shows memories are pretty weak
EVALUATION
POSITIVE: provides evidence for assumption that info can remain in LTM for V long periods of time
-NEGATIVE: emotional significance of students, great opportunity for rehearsal, can't be generalised
-POSITIVE: high mundane realism, recalled real life memories, representative of natural behaviour, high external validity
MULTI STORE MODEL- ATKINSON AND SHIFFRIN
3 STORES: SENSORY STORE, SHORT TERM STORE, LONG TERM STORE
-environment is initally received by sensory stores
-some info in the sensory store is attended to and processed further by ST store
- some info from STM is transferred to LTM through rehearsal or repeating it
-more something is rehearsed, longer you remember it
EVALUATION:
POSITIVE: case studies of brain damaged patients support MSM model
-GLANZER AND CUNITZ- when rehearsal is prevented, recency effect disappears
- evidence encoding is diff. in STM and LTM
-huge differences in STM and LTM capacity
NEGATIVES:
CRAIK &LOCKHART: suggest level at which we process info determines how well we remember it
-people who had severly impaired STM could still make new long term memories
-makes sense to identify several long term memory stores. ATKINSON AND SHIFFRON focus on declarative knowledge
LEVELS OF PROCESSING THEORY- CRAIK AND LOCKHART
-alternative to MSM
-focuses on how info is encoded
-argued rehearsal is not sufficient enough to account for LTM, said it was level at which something was processed that determined whether we remembered it
- SHALLOW PROCESSING: what it looked like
-INTERMEDIATE: what it sounds like
-SEMANTIC: what it means
EVALUATION:
POSITIVE: Hyde and Jenkins supported
-deals with flaws of MSM
-could be applied to improving memory
NEGATIVE: cannot control what goes on in peoples minds
-too vague, not clear what level of processing is neccesary
- doesnt support Craik and Lockhart
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