Memory Flashcards
What is memory
- process of retaining learned information
- accessing information when needed
What are the processes in memory (3)
- coding
- storage
- retrieval
What is coding
- the way information is changed so it can be stored in memory
What is storage
- keeping information within the memory system until it is needed
What is retrieval
- recovering information stored in memory system when it is required
What are the different memory stores (3)
- sensory register (SR)
- short term memory (STM)
- long term memory (LTM)
What is the sensory register (SR)
- contains unprocessed impressions of information received through senses
- has separate stores for each sensory input
What are the different stores within the sensory register and what are they for (5)
- iconic store
=> for visual information - echoic store
=> for auditory information - haptic store
=> for physical senses of touch and internal muscle tensions - gustatory store
=> for taste information - olfactory store
=> for information related to smell
What is the short term memory
- temporary store for information received from sensory register
What is the long term memory
- permanent store for information from short term memory
What factors cause differences between the STM and the LTM (3)
- coding
- capacity
- duration
How is information coded in the sensory register
- coding is modality specific
- means each sensory store is coded differently
How is information in the short term memory coded and who researched into this
- Baddeley (1966)
- gave participants 4 lists of words
- list A sounded similar, B sounded dissimilar, C had similar meaning, D had dissimilar meanings
- found participants recalled B better than A
- STM is thus coded acoustically
How is information in the long term memory coded and who researched into this
- Baddeley (1966)
- similar to test for stm but had a 20m delay to ensure it was passed to LTM
- found participants recalled D better than list C
- LTM is thus coded semantically
How would Baddeley (1966) be evaluated (positive and negative)
- was a lab study
- easy to replicate as variables have been controlled
- high reliability
- findings have low ecological validity
- lists were seen as artificial
- setting was also seen as artificial
What is the capacity of the sensory register
- unlimited
What is the capacity of the short term memory and who researched into this
- Jacobs (1887) digit span test
- gave participants several sequences of digits or letters and asked them to repeat in order
- sequence got longer each time
- found on average we can hold 9.3 digits and 7.3 letters
- Miller (1956) reviewed researched studies and concluded span of STM is 7 (+/-)2
- new information displaces old information
- easier to remember through chunking
How can the research into the capacity of the short term memory by Jacobs (1887) be evaluated
- first to acknowledge STM capacity gradually improves with age
- study conducted long time ago
- may not have been done to same scientific standard as of today
- validity and findings can be questioned
What is the capacity of the long term memory
- unlimited
What is the duration of the sensory register
- 250 milliseconds
What is the duration of the short term memory and who researched into this
- Peterson and Peterson (1959) used nonsense trigrams
- asked participants to count backwards from 100 in 3s to prevent maintenance rehearsal of trigrams and storing in STM
- after 3 seconds, recall was 90%
- after 9 seconds, recall was 20%
- after 18 seconds, recall was 2%
- concluded information lasts for 18-30 seconds in STM before it is lost due to decay
How would the study into the duration of the STM by Peterson and Peterson (1959) be evaluated
- researched used fixed timings
- elimated noise and other factors
- high control using standardised procedures
- findings could have be caused by interference from previous trigrams instead of short duration
- lists lack meaning => lack ecological validity
What is the duration of the long term memory and who researched into this
- Bahrick (1979) tested 400 participants (17-74 yo)
- photo recognition test showing 50 photos and deciding if they were in their class or not
- in free recall test, participants asked to list names they could remember from graduating class
- 90% accuracy within 15 years and 70% after 48 for photo recognition
- 60% accuracy within 15 years and 30% after 48 for free recall
- concluded duration of LTM is a lifetime but retrieval failure occurs and we need retrieval cues
How would the study into the duration of the LTM by Backrick (1979) be evaluated
- high ecological validity
- material more useful than that of Peterson and Peterson (1959)
- problematic to control for extraneous variables
- people may have stayed in touch or looked at yearbook after leaving
What is the multi store model of memory (MSM)
- developed by Atkinson and Shiffrin (1968)
- explains how information flows from one memory store to another
- three structures; SR, STM, LTM
- each structure differs; capacity, duration, coding
How does the multi store model of memory look like
How is the sensory register said to be in the multi store model of memory
- environmental stimuli received through senses enter SR
- short duration store retaining unprocessed impressions of information received through senses
- has separate sensory store for each sensory input
- capacity is unlimited
- duration is 250 milliseconds
- fraction of information is attended to and sent to STM, rest is lost to decay
How is the short term memory said to be in the multi store model of memory
- information in SR attended to is acoustically coded into STM
- information may be recalled and then forgotten before transferred to LTM
- capacity of 7 (+/-) 2
- new information displaces old information
- duration of 18-30 seconds, old information decays
- information is kept in STM through maintenance rehearsal
- information is sent to LTM through elaborative rehearsal
How is the long term memory said to be in the multi store model of memory
- semantically coded
- potentially infinite capacity
- potentially lifetime duration
- information can be retrieved by STM and then recalled
- sometimes information cannot be accessed due to retrieval failure so retrieval cues are necessary
What are positive evaluation points for the multi store model of memory (3)
- Scoville (1957)
- Shallice and Warrington (1970)
- Murdock (1962)
How is Scoville (1957) an example of a positive evaluation point for the multi store model of memory
- patient HM epileptic
- attempted to treat epilepsy by removing brain areas, including hippocampus
- results in HM being unable to code new LTM although is STM was unaffected
- supports idea of separate and distinct STM and LTM
How is Shallice and Warrington (1970) an example of a positive evaluation point for the multi store model of memory
- patient KF motorbike accident
- reduced STM of 1-2 digits but LTM normal
- supports separate STM and LTM
- however, KF had good STM for visual tasks but not verbal tasks
- suggests more than one type of STM, contradicting multi store model
- also, according to MSM, LTM are retrieved by STM, so if STM is damaged then should be difficult to retrieve LTM however KF could access without difficulty
How is Murdock (1962) an example of a positive evaluation point for the multi store model of memory
- presented participants with long list of words to be recalled in any order (free recall experiment)
- words are beginning and end recalled better due to serial position effect
- words at beginning transferred to LTM due to rehearsal (primacy effect)
- words at end are still in STM (recency effect)
What are negative evaluation points for the multi store model of memory (2)
- oversimplified
- Baddeley and Hitch (1974)
How is oversimplification an example of a negative evaluation point for the multi store model of memory
- assumes there is only one type of STM and one LTM
- research shows several types of STM, such as different ones for verbal information and non-verbal information
- researcher also shows several types of LTM, such as episodic, semantic and procedural memory
How is Baddeley and Hitch (1974) an example of a negative evaluation point for the multi store model of memory
- could not explain ability to multi task
- if there is only one type of STM, multi tasking would not be possible
- however many people are able to multi task
What is the working memory model
- Baddeley and Hitch (1974)
- questioned idea promoted by MSM that people only have one type of STM
- also argued STM is more complex than just being a temporary store
- saw STM as active store holding several pieces of information
- argued LTM is passive store
What are the different components of the working memory model (4)
- central executive
- phonological loop
- visuo-spatial sketchpad
- episodic buffer
What is the central executive
- drives whole working memory, and allocates data to other components (slave systems)
- deals with cognitive tasks; mental arithmetic, reasoning and problem solving
- individuals have limited attentional capacity, tasks that are automated make less attentional demands on the central executive and so leave us free to perform other tasks
- e.g. person who has been driving for 10 years finds driving becomes an automated task and does not make as many attentional demands so can talk or do other tasks with more ease than a learner driver
What is the phonological loop
- component dealing with spoken and written material
- two sub components; phonological store and articulatory loop
What is the phonological store
- inner ear
- linked to speech perception
- holds information in speech based form for 1-2 seconds
What is the articulatory loop
- inner voice
- linked to speech production
- used to rehearse and store verbal information from phonological store
- allows for maintenance rehearsal
What is the visuo-spatial sketchpad
- stores and processes information in a visual or spatial form
- used for navigation
- inner eye
- two sub components; visual cache and inner scribe
What is the visual cache
- stores visual material about form and colour
What is the inner scribe
- handles spatial relationships
What is the episodic buffer
- Baddeley (2000) added another component
- realised model needed general storage component to operate properly
- this is because slave systems only deal with processing and temporary storage of specific types of information and CE has no storage capacity at all
- limited capacity store, integrating information from STM components and LTM
What are positive evaluation points for the working memory model (4)
- Shallice and Warrington (1970)
- Baddeley and Hitch (1974)
- Baddeley et al. (1975)
- practical applications
How is Shallice and Warrington (1970) an example of a positive evaluation point for the working memory model
- patient KF, motorbike accident
- poor STM for verbal but not visual words
- suggests more than one type of STM
- shows we have a type of STM for verbal tasks and another for visual
How is Baddeley and Hitch (1974) an example of a positive evaluation point for the working memory model
- gave participants dual task
- asked to complete reasoning task, using CE, at the same time as a reading aloud task, using phonological loop
- participants could do both simultaneously, supporting idea of separate components in STM
How is Baddeley et al. (1975) an example of a positive evaluation point for the working memory model
- gave participants brief visual presentations of lists of words
- lists were made up of short or long words
- participants asked to recall list immediately in correct order
- found participants could recall more short than long words
- word length effect, supports idea that phonological loop can hold as many items as it can in 1.5-2 seconds rather than 7 (+/-2)