Memory — Edexcel GCSE Psychology
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Memory explained
Memory covers 5 specification points, including A.
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input b. processing c. output d. encoding… and A. duration b. capacity. Open a point below for its explanation and revision guidance.
2.1.1 Know the structure and process of memory and information processing: a. input b. processing c. output d. encoding e. storage f. retrieval
Memory functions like a computer through information processing. It begins with 'input', where sensory information from the environment enters the system (e.g., hearing a voice). Next is 'processing', where the brain interprets this information. Finally, 'output' occurs, which is the resulting behaviour, such as writing a note. To retain information, three stages occur. 'Encoding' transforms sensory input into a usable format, like acoustic or semantic codes. 'Storage' involves holding this encoded information over time. 'Retrieval' is the process of accessing and bringing stored information back into conscious awareness when needed, like recalling a fact during an exam.
2.1.2 Understand the features of short-term and long-term memory, including: a. duration b. capacity
Short-term memory (STM) and long-term memory (LTM) differ significantly. 'Capacity' refers to how much information a memory store can hold. STM has a limited capacity, typically holding 5 to 9 items (often called the magic number 7 plus or minus 2), like remembering a phone number just long enough to dial it. In contrast, LTM has a theoretically unlimited capacity. 'Duration' refers to how long information remains in the store. STM has a brief duration, lasting up to 30 seconds without rehearsal. LTM can store information for a lifetime, from a few minutes to many decades, such as remembering a childhood home. Understanding these distinctions is crucial for evaluating memory models.
2.1.3 Understand retrograde and anterograde amnesia, including: a. the term ‘retrograde amnesia’ b. the term ‘anterograde amnesia’ c. the symptoms of retrograde amnesia d. the symptoms of anterograde amnesia
Retrograde amnesia is the inability to recall memories formed before the onset of brain damage. Symptoms include forgetting past events or people known prior to the injury, though the ability to form new memories remains intact. For example, a patient might forget their wedding day but easily remember a new doctor's name. Anterograde amnesia is the inability to form new memories after the onset of the condition. Symptoms involve a failure to retain new information, meaning the person cannot remember recent events or people they have just met, although their older past memories remain intact. A classic example is a patient who can recall their childhood perfectly but cannot remember a conversation they had just five minutes ago.
2.1.4 Understand the active process of memory through the Theory of Reconstructive Memory (Bartlett, 1932), including strengths and weaknesses of the theory: a. how schemas are formed b. how schemas influence memory
Bartlett's (1932) Theory of Reconstructive Memory states memory is an active process. We store fragments of information and reconstruct them during recall, altering details to fit expectations. This is driven by schemas: mental frameworks formed through personal experiences and culture. Schemas influence memory by causing us to omit unfamiliar details or change elements to make sense of them. For example, recalling a story about a canoe might be changed to a boat to fit a cultural schema. A strength is its real-world application to eyewitness testimony, highlighting memory unreliability. A weakness is that Bartlett's original research lacked strict experimental controls, making his findings less scientifically rigorous.
2.1.5 Understand the structure and process of memory through the Multi-store Model of Memory (Atkinson and Shiffrin, 1968), including strengths and weaknesses of the theory: a. sensory register b. the capacity of short-term memory c. the duration of short-term memory d. the capacity of long-term memory e. the duration of long-term memory f. role of attention in memory g. role of rehearsal in memory
Atkinson and Shiffrin's (1968) Multi-store Model describes memory as a linear process through three stores. Information enters the sensory register, which has a large capacity but a brief duration (under a second). If attention is paid, data transfers to short-term memory (STM). STM has a limited capacity of 7+/-2 items and a duration of up to 30 seconds. Maintenance rehearsal keeps information in STM, while prolonged rehearsal transfers it to long-term memory (LTM). LTM has an unlimited capacity and a duration of up to a lifetime. A strength is supporting evidence from case studies like HM, showing separate STM and LTM stores. A weakness is that it oversimplifies memory, ignoring different types of LTM and STM.
Your focus
- Define the terms input, processing, and output in the context of information processing.
- Explain the processes of encoding, storage, and retrieval in memory.
- Apply the stages of memory and information processing to real-world examples.
Show all 15 objectives
- Define capacity and duration in relation to memory stores.
- Identify the specific capacity and duration limits of short-term memory.
- Describe the capacity and duration features of long-term memory.
- Define the terms retrograde and anterograde amnesia.
- Describe the symptoms associated with retrograde amnesia.
- Describe the symptoms associated with anterograde amnesia.
- Explain how schemas are formed through experience and culture.
- Describe how schemas actively influence the reconstruction of memory.
- Evaluate Bartlett's Theory of Reconstructive Memory by identifying its strengths and weaknesses.
- Describe the capacity and duration of the sensory register, short-term memory, and long-term memory.
- Explain the roles of attention and rehearsal in the transfer of information between memory stores.
- Evaluate the Multi-store Model of Memory by explaining its methodological strengths and theoretical weaknesses.
Memory flashcards
Card 1 of 8
Input
Memory exam tips
Marking Points
- Identify input as the raw sensory information received from the environment.
- Describe processing as the brain's active manipulation and interpretation of data.
- Define output as the behavioural response or action resulting from processed information.
- Explain encoding as the transformation of sensory data into a storable format, such as visual or acoustic codes.
- Define storage as the retention and maintenance of encoded information over time.
- Describe retrieval as the process of locating and accessing stored information for conscious use.
- State the capacity of short-term memory as approximately 5 to 9 items.
- State the duration of short-term memory as up to 30 seconds without active rehearsal.
- Describe the capacity of long-term memory as theoretically unlimited.
- Describe the duration of long-term memory as potentially lasting a lifetime.
- Define retrograde amnesia as the loss of memory for events occurring before brain damage.
- Identify symptoms of retrograde amnesia, such as forgetting personal history or past facts.
- Define anterograde amnesia as the inability to form new memories after brain damage.
- Identify symptoms of anterograde amnesia, such as failing to remember recent conversations or new faces.
- Define reconstructive memory as the active process of piecing together memory fragments during recall.
- Explain that schemas are mental frameworks formed through past experiences and cultural expectations.
- Describe how schemas influence memory by causing omissions, rationalisations, or transformations of unfamiliar details.
- Identify a strength of the theory, such as its application to understanding the unreliability of eyewitness testimony.
- Identify a weakness of the theory, such as the lack of standardised procedures in Bartlett's original research.
- Identify the sensory register as the initial store, requiring attention to transfer information to short-term memory.
- State that short-term memory has a limited capacity of 7+/-2 items and a duration of up to 30 seconds.
- Explain that rehearsal is the necessary mechanism to transfer information from short-term memory to long-term memory.
- State that long-term memory has a potentially unlimited capacity and a duration that can last a lifetime.
- Evaluate the model by providing a valid strength, such as clinical evidence supporting separate stores, or a weakness, such as its oversimplified linear structure.
Examiner Tips
- 💡Use the computer analogy (input, process, output) to structure your answers about information processing.
- 💡When defining retrieval, always mention that it involves bringing information back into conscious awareness.
- 💡Be prepared to apply the stages of memory to a novel scenario, such as learning a new skill or studying for a test.
- 💡Memorise the specific numbers for STM: 5 to 9 items for capacity and up to 30 seconds for duration.
- 💡Use the phrase 'theoretically unlimited' when describing the capacity of LTM to show precise understanding.
- 💡When comparing STM and LTM, explicitly use the terms 'capacity' and 'duration' to ensure you address the specific features required.
- 💡Use the prefix retro (meaning past) to help you remember that retrograde amnesia affects past memories.
- 💡When describing symptoms, use concrete examples like forgetting a childhood pet for retrograde or forgetting a meal just eaten for anterograde.
- 💡Read scenario questions carefully to determine whether the person is struggling with old memories or forming new ones before identifying the type of amnesia.
- 💡Use the term rationalisation when explaining how people change unfamiliar details to make sense of them based on their schemas.
- 💡When evaluating the theory, link its strengths directly to real-world applications, such as police interviews and eyewitness testimony.
- 💡Be prepared to apply the concept of schemas to novel scenarios provided in the exam, identifying how a person's background might alter their recall.
- 💡Use the specific terms 'capacity' and 'duration' correctly when describing the distinct features of each memory store.
- 💡When evaluating the model, use specific evidence, such as the case of HM, to support the existence of separate memory stores.
- 💡Draw a quick flowchart of the model on your rough paper to help visualise the processes of attention and rehearsal during the exam.
Common Mistakes
- Confusing encoding with storage. Correction: Encoding is the transformation of data into a usable format, whereas storage is the maintenance of that data over time.
- Using input and encoding interchangeably. Correction: Input is the raw sensory data entering the system, while encoding is the active process of converting that data into a memory trace.
- Misunderstanding output as only verbal communication. Correction: Output includes any behavioural response or action resulting from processed information, not just spoken words.
- Stating STM duration is a few minutes. Correction: STM duration is strictly up to 30 seconds unless the information is actively rehearsed.
- Confusing capacity and duration. Correction: Capacity is the amount of information held (e.g., 7 items), while duration is the length of time it is held (e.g., 30 seconds).
- Assuming LTM capacity has a measurable limit. Correction: LTM capacity is considered theoretically unlimited, as no maximum limit has been identified.
- Confusing retrograde and anterograde amnesia; remember retro means backwards (past memories lost) and antero relates to forward (future memories cannot be formed).
- Believing amnesia affects all types of memory equally; correct this by noting that procedural memory often remains intact even if episodic memory is lost.
- Assuming anterograde amnesia means forgetting the past; correct this by understanding it only affects the creation of new memories post-injury.
- Believing memory works like a video camera; correct this by explaining that memory is an active reconstruction of events, not an exact replay.
- Confusing schemas with memories themselves; correct this by defining schemas as the underlying frameworks that shape how memories are encoded and retrieved.
- Stating that Bartlett's theory proves memory is always completely false; correct this by noting that while details may change, the core meaning is often retained.
- Confusing the capacity and duration of STM and LTM. Correction: Remember that STM has limited capacity (7+/-2 items) and duration (up to 30 seconds), whereas LTM is potentially unlimited in both.
- Forgetting the specific role of attention. Correction: Attention is the exact mechanism required to move information from the sensory register into the short-term memory store.
- Assuming rehearsal is only for keeping information in STM. Correction: Rehearsal is also the mechanism that transfers information from STM into LTM.