Topic 2: Memory Revision Notes

Aim of Bartlett's (1932) Study

Bartlett aimed to investigate how memory is reconstructed over time, specifically how cultural schemas and prior knowledge influence the recall of an unfamiliar story.

Procedure of Bartlett's (1932) Study

Participants, mostly students from the University of Cambridge, were told a Native American folk tale called 'War of the Ghosts'. This story had unusual elements, names, and a supernatural theme that were unfamiliar to their Western cultural background. Participants were then asked to reproduce the story multiple times over varying periods (e.g., after minutes, days, weeks, months, or even years) using serial reproduction (passing the story from one person to the next) or repeated reproduction (recalling the story themselves multiple times).

Findings and Conclusion of Bartlett's (1932) Study

Bartlett found that participants' recall of the story became progressively shorter, more coherent, and distorted over time. They tended to omit details that did not make sense to them, rationalise improbable events, and change cultural elements (e.g., 'canoes' became 'boats', 'hunting seals' became 'fishing') to fit their own cultural schemas. He concluded that memory is not an exact reproduction but an active, reconstructive process influenced by an individual's existing knowledge, beliefs, and cultural background, rather than a perfect, verbatim recall.

Strengths of Bartlett's (1932) Study

A strength is that the study used a meaningful story ('War of the Ghosts') rather than artificial word lists, which gives it higher ecological validity because it reflects how people remember information in real-life situations. The findings provided crucial insights into the concept of reconstructive memory and schemas, which have influenced subsequent memory research.

Weaknesses of Bartlett's (1932) Study

A weakness is that Bartlett did not use standardised procedures. He allowed participants to recall the story at their own pace and often varied the recall intervals. This lack of control makes it difficult to replicate the study and assess the reliability of the findings. The scoring of recall was also subjective, as Bartlett interpreted the changes made by participants, which could introduce researcher bias and reduce the objectivity of the results. The sample was mainly British university students, which limits the generalisability of the findings to other populations and cultures.

Aim and Procedure of Peterson and Peterson (1959)

Peterson and Peterson (1959) aimed to investigate the duration of short-term memory (STM) and the role of rehearsal in maintaining information within it. Their procedure involved presenting participants with consonant trigrams (e.g., 'TRL'). Immediately after seeing a trigram, participants were given a three-digit number and instructed to count backwards in threes from that number. This counting task served as an interference task to prevent rehearsal of the trigram. The recall intervals (the time between seeing the trigram and recalling it) varied, typically being 3, 6, 9, 12, 15, or 18 seconds. After the allocated time, participants were asked to recall the trigram.

Findings and Conclusion of Peterson and Peterson (1959)

The findings consistently showed a rapid decline in recall accuracy as the time interval increased. After just 3 seconds, approximately 80% of trigrams were recalled correctly. This figure dropped sharply to around 50% after 6 seconds, and by 18 seconds, less than 10% of trigrams were recalled. Peterson and Peterson concluded that information in short-term memory has a very limited duration, decaying within approximately 18-30 seconds if rehearsal is prevented. This study strongly supported the idea that STM is a separate memory store with a distinct, short duration.

Strengths and Weaknesses of the Study

A strength of Peterson and Peterson's study is its highly controlled laboratory setting. The use of a distractor task and precise timing allowed for good control over extraneous variables, increasing the internal validity. The study established a clear cause-and-effect relationship between the prevention of rehearsal and the decay of STM. However, a weakness is the artificial nature of the task (recalling meaningless trigrams and counting backwards), which lacks ecological validity. This makes it difficult to generalise the findings to how memory works in real-life situations, where people usually try to make sense of information. The use of trigrams might also encourage acoustic encoding, limiting the generalisability to other types of information.

The Theory of Reconstructive Memory

Bartlett (1932) proposed that memory is an active, reconstructive process, not a passive retrieval of exact copies. When we remember, we combine factual fragments with our existing knowledge, which can lead to alterations. This means memory is prone to errors and distortions, as we fill in gaps or change details to make them fit what we expect or already know.

Schemas and Their Influence on Memory

Schemas are mental frameworks or organised packets of information about the world, built from past experiences. They help us understand and predict new situations. Schemas influence all stages of memory: encoding, storage, and retrieval. For example, a 'birthday party' schema would include cakes, presents, and guests. When recalling an event, we might unconsciously use these schemas to add details that weren't present or alter recall to fit the schema, making memories more coherent but less accurate.

Bartlett's 'War of the Ghosts' Study

Bartlett's classic study (1932) demonstrated reconstructive memory. Participants were asked to recall a complex Native American folk story, 'The War of the Ghosts,' repeatedly over time. He found their recollections were often distorted: details were omitted, simplified, or altered to fit their own cultural schemas. For instance, the 'canoes' became 'boats,' and supernatural elements were rationalised. This showed how existing knowledge structures influence memory reconstruction, often making it more conventional or familiar.

Evaluation of Reconstructive Memory

A strength is its ecological validity, as it explains memory errors often seen in real life, such as eyewitness testimony inaccuracies. However, one limitation is that laboratory studies, like Bartlett's, may lack ecological validity, as the story was unusual and not personally relevant to participants. The theory also struggles to explain how we accurately recall highly significant or emotional events immediately after they occur. Another criticism is that schemas are difficult to define and measure objectively, making the theory hard to empirically test fully.

What is Reductionism?

Reductionism is the belief that complex phenomena, such as human behaviour or cognitive processes like memory, can be explained by reducing them to simpler, more fundamental components. A 'reductionist' explanation focuses on basic units, such as neurotransmitters for memory, ignoring broader influences. There are different levels of reductionism, such as biological reductionism (explaining psychological events by focusing on biological mechanisms) and environmental reductionism (explaining behaviour through simple stimulus-response links). Strengths include scientific credibility and the ability to conduct controlled research, while weaknesses include oversimplification and a lack of ecological validity.

What is Holism?

Holism is the idea that human behaviour should be viewed as a whole integrated experience, rather than as separate components. A 'holistic' perspective would consider how various factors, such as biological, psychological, social, and cultural influences, interact to produce a specific outcome, like memory recall. It argues that the 'whole is greater than the sum of its parts'. Strengths include providing a more complete understanding of complex behaviour and being more applicable to real-life situations. Weaknesses involve challenges in operationalising variables for scientific research, making it more difficult to test empirically and potentially leading to less rigorous evidence.

Reductionism and Holism in Human Memory

When applied to human memory, a reductionist approach might try to explain memory by focusing on specific brain regions responsible for storage, or the role of particular neurotransmitters in memory formation. For example, research into the hippocampus's role in long-term memory is reductionist. A holistic approach to memory would consider how personal experiences, emotions, social interactions, and cultural backgrounds influence what and how we remember. For instance, studies on flashbulb memories, which are often vivid and detailed due to highly emotional and significant events, take a more holistic view by integrating emotion and personal significance. Reductionist approaches allow for clear experimental manipulation (e.g., drug effects on memory), while holistic approaches offer a richer, more contextual understanding (e.g., how reconstructive memory is influenced by schema).