Memory Flashcards
(45 cards)
What is coding?
Coding is the format in which information is stored in various memory stores.
Describe research into coding.
Baddeley- gave different lists of words to four groups to remember. (18 participants per group)
Group 1: acoustically similar words
Group 2: acoustically dissimilar words
Group 3: semantically similar words
Group 4: semantically dissimilar words
STM recall: when asked to recall the words immediately after hearing them, participants did worse with acoustically similar words.
LTM recall: when asked to recall the words 20 minutes later, participants did worse with semantically similar words.
This suggests that information is coded semantically in LTM and acoustically in STM.
Evaluate research into coding.
- findings have limited application.
- Lab experiment: artificial task, low external validity, meaningless task, good control over extraneous variables
What is meant by the term capacity?
The amount of information that can be held in a memory store.
Explain research into capacity.
Jacobs: Participants were presented with a string of letters or digits. They had to repeat them back int he same order. The number of letters or digits increased until the participant failed to recall the sequence correctly.
The mean number of items for digits was 9.3 and for letters was 7.3. Capacity increased with age during childhood.
Jacobs concluded that STM has a limited storage capacity of 5-9 items.
Miller: noted that things come in 7s such as notes on the musical scale and days in the week. This suggests memory span is 7, plus or minus 2. He also noted that people can recall 5 words as well as they can recall 5 letters. He suggested they do this by chunking- grouping sets of digits or letters into unites or chunks.
Evaluate research into capacity.
Lacks validity as confounding variables such as whether or not participants were paying full attention was not controlled,
Miller may have overestimated the capacity of STM. Cowan reviewed other research and concluded that the capacity of STM was only about four chunks, not 7.
Define the term duration.
The length of time information can be held in memory.
Explain research into the duration of STM.
Peterson and Peterson- showed 24 psychology students trigrams of 3 random consonants and asked them to recall them after 3, 6, 9, 12, 15, or 18 seconds. During the pause they were asked to count backwards in threes, this was an interference task to prevent rehearsal.
It was found that after 3 seconds, participants could recall about 80 percent of trigrams correctly. After 18 seconds, only 10 percent were recalled correctly.
Conclusion: When rehearsal is prevented, very little can stay in the STM for longer than 18 seconds.
Evaluate the study of Peterson and Peterson.
Lab experiment- low external validity, meaningless and artificial task, good control over variables
Explain research into the duration of long term memory.
Bahrick et al conducted a study into the duration of longterm memory.
Procedure: 392 participants aged between 17 and 74 from Ohio. High school year books were obtained and participants were asked to do a:
Free recall test
Photo recognition test
Name recognition test (matching names to pictures)
Results:
Within 15 years- 90 percent of names and faces were recognised and 60 percent accurate on free call.
After 30 years- free recall falls to 30 percent
After 48 years- name recognition 80 percent accurate, photo recognition 40 percent accurate
This demonstrates very long term memory within a natural setting.
What is the multi-store model of memory?
(Atkinson and Shiffrin) A structural representation of how memory works in terms of three stores; the sensory register, short-term memory, and long-term memory. It also describes how memory is transferred from one store to another and how it is remembered and forgotten.
Explain the three parts of the multi-store model of memory.
Sensory Register: stimuli from the environment such as sight, smells and sound first enter the sensory register which consists of five stores- one for each sense. This has a very large capacity but a short duration of about half a second. The two main stores are called iconic memory (visually coded information) and echoic memory (acoustically coded memory). Attention is required for information to be transferred from the sensory store into the STM.
Short term memory: has a limited capacity store as it can only hold 5-9 items. Information in the STM is acoustically coded and lasts for around 30 (unless it is rehearsed).
Maintenance rehearsal occurs when we repeat information to ourselves over and over again. Information stays in the STM for as long as we rehearse it and passes into LTM if we rehearse it for long enough.
Long-term memory: LTM has an unlimited capacity and indefinite duration. It codes information semantically.
When we want to recall it has to be transferred back to the STM by the process of retrieval- memories cannot be recalled directly from the LTM.
Evaluate the multi-store model of memory.
(+) Patient HM underwent brain surgery to treat his epilepsy. His hippocampus was removed and he lost all long term memory. Despite this, his STM was intact. This supports the MSM’s suggestion that long-term memory is stored separately from STM.
(+) Baddeley: Found that STM is coded acoustically and LTM is coded semantically, suggesting that the two memory stores are separate and independent.
(-) Craik and Watkins: suggested there is more than just one type of rehearsal. The MSM says the amount of rehearsal is what is important in transferring information to the LTM but it was found that the type of rehearsal is what actually matters. Maintenance rehearsal just keeps information in the STM, but elaborative rehearsal is needed for LTM storage. This is when you link the information to your existing knowledge or think about what it means.
(-) Over-reliance on lab studies: In real life, we form memories about meaningful things but studies use artificial materials such as numbers and consonants which do not resemble things we normally form memories of. This is a limitation as the evidence on which the MSM is based has low validity.
What did Tulving propose?
That the Multi-store memory model was too simplistic and inflexible and that there are three types of LTM stores that contain different types of information. He called them episodic memory, semantic memory, and procedural memory.
Explain the three types of LTM.
Episodic memory: A long term memory store for personal events (episodes) from our lives such as birthdays or going to places. They are time-stamped, so we remember when they happened and include several elements such as behaviours and places which are interwoven to form a single memory. We have to make a conscious effort to recall these.
Semantic memory: A long-term memory store for our knowledge of the world such as facts and our knowledge of what words and concepts mean. These are not time-stamped and also need to be recalled deliberately.
Procedural memory: A long term memory store for our knowledge of how to do things. This includes our memories of learned skills. These are often hard to explain to others and we can recall these memories without making a conscious effort.
Evaluate types of long-term memory.
(+) Evidence from case studies: Patient HM and Clive Wearing- both had impaired episodic memory by unaffected semantic and procedural memory e.g. Wearing was a musician and could still sing, read and play. Supports that there are different types of LTM stores and that they are stored in different parts of the brain.
(+) Neuroimaging evidence: Tulving et al got participants to perform various memory tasks while their brains were scanned using a PET scanner. They found that episodic memory was controlled by the right prefrontal cortex and semantic memories were controlled by the left prefrontal cortex. Supports that there is a physical reality to different types of LTM and gives it good validity.
(+) Real-life applications: knowledge of the different types of LTM allows psychologists to target certain kinds of memory in order to improve people’s lives- e.g. Belleville et al. (2006) found that episodic memories could be improved in older people with a cognitive
impairment through training.
(-) Cohen and Squire: Propose there are actually two types of LTM; declarative memory (made up of episodic and semantic memory)- memories which can be consciously recalled and non-declarative memories (procedural).
What is the working memory model?
A representation of STM that suggests that STM is a dynamic processor of different types of information using sub-units coordinated by a central decision-making system (Baddeley and Hitch)
Explain the different parts of the working memory model.
1) Central executive: the component of the WMM that co-ordinates the activities of the three subsystems in memory. It is an attentional process that monitors incoming data, makes decisions and allocates ‘slave systems’ to tasks. It has very limited processing capacity.
2) Phonological loop: The slave system that deals with auditory information and preserves the order in which information arrives.
- Phonological store: stores the words you hear
- Articulatory process: allows maintenance rehearsal. The loop has a capacity of two seconds worth of what you can say.
3) Visuo-spatial sketchpad: the slave system responsible for visual and spatial information. It has a limited capacity of about 3-4 objects (Baddeley).
(Logie) divided the VSS into the visual cache ( stores visual data) and the inner scribe (records arrangement of objects in the visual field)-sometimes called our inner eye.
4) Episodic buffer: Added to the model later on in 2000. This slave system is a temporary store for information that brings together material from the other subsystems (visual, spatial and verbal information) into a single memory rather than separate strands. It maintains a sense of time sequencing/ episodic chronological ordering. It links working memory to LTM and wider cognitive processes such as perception.
Evaluate the working memory model.
(+) Clinical evidence: Case study of patient KF- suffered brain damage that led to poor STM ability for verbal information, but did not impact his ability to process visual information ( he could recall digits and letters but not sounds). This suggests that just his phonological loop had been damaged, leaving other areas unaffected. This supports the existence of separate visual and acoustic stores.
(+) Evidence for visuo-spatial sketchpad: Baddeley’s study of dual-task performance show that participants had more difficulty performing 2 visual tasks at the same time (tasks that use the same slave system) than they had performing both a visual and verbal task at the same time (different slave systems). This means there must be a separate slave system that processes visual input (the VSS).
(-) Lack of clarity over the central executive: Cognitive psychologists suggest that the CE doesn’t explain anything. Baddeley also recognised this, saying that the CE is the ‘most important but least understood component’ of the WMM. Some psychologists believe the CE consists of separate components. This is a limitation as it means the WMM hasn’t been fully explained.
(+) Brain scanning studies support the WMM: Braver et al gave participants tasks that involved the central executive while they were having a brain scan. Greater activity in the prefrontal cortex was found, and the activity in this area increased when the task became harder. This supports the WMM as the CE has to work harder when the demands increase.
Name the two explanations for forgetting.
Interference
Retrieval Failure
What is interference?
Forgetting because one memory blocks another, causing one or both memories to be distorted or forgotten.
Interference is proposed mainly as an explanation for forgetting in LTM. Once information has reached LTM, it is more-or less permanent and so forgetting long term memories is most likely because ewe cannot access them even though they are available. Interference between memories makes it harder for us to locate memories and is experienced as ‘forgetting’.
Explain the types of interference.
Proactive interference: when an older memory interferes with a newer one e.g. writing 2020 even though it is 2021
Retroactive interference: when a new memory interferes with an older one e.g. learning loads of new names and so forgetting old ones.
Explain the effects of similarity on forgetting.
McGeoch and McDonald found Interference is worse when the memories are similar. They studied retroactive interference by changing the amount of simliarity between two sets of materials. Participants learned the same first list to 100 percent accuracy before each group learned a different type of list:
G1: synonyms G2: antonyms G3: unrelated words to OG list G4: consonant syllables G5: 3 digit numbers G6: no new list
They found that the ability to recall the first list depended on the nature of the second list. Those who learned the most similar material (synonyms) produced the worst recall. This shows interference is strongest when memories are similar.
Evaluate interference as an explanation for forgetting.
(+) Evidence from lab studies: It has been shown consistently in thousands of lab experiments that interference is likely to be a common way in which we forget LTMs e.g. McGeoch and McDonald. Good control over variables = confidence that interference is a valid explanation for forgetting.
(-) Artificial materials: Interference is more likely to be demonstrated in a lab setting than in real life as the stimulus in lab experiments is usually a meaningless list of words, while in real life we remember things such as names and birthdays. This is a limitation because it means interference may not be as likely an explanation for forgetting in real life.
(-) Related to the above, how much forgetting can be attributed to interference is unclear.
(-) Forgetting may be biological- the trace decay theory suggests that when something new is learned, a neurochemical, physical “memory trace” is formed. Over time this trace tends to disintegrate, unless it is occasionally used. Decay theory states the reason we eventually forget something or an event is because the memory of it fades with time.
(+) Support from real-life studies: Baddeley and Hitch asked rugby players to try and remember the names of the teams they had played so far that season. Most players had missed games and so the last team they played might have been 2 or 3 or more weeks ago. They found that accurate recall did not depend on how long ago they played the match but how many matches had been played in the meantime. This supports interference and shows that it can be applied to everyday situations.