Key idea: Memory doesn't replay the past like a video — it rebuilds it, which is why it can be confidently wrong.
In the learning and cognition context, memory is a core cognitive process, and understanding it means seeing that it is reconstructive, not a perfect recording. This links to the concepts of measurement (models make memory testable) and bias (schemas distort what we recall).
Remember: Rebuild, don't replay. Memory is reconstructed, so it can be distorted.
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Key idea: Models describe memory's structure; schemas explain why recall is distorted.
Memory at a glance
The multi-store model
Memory as sensory, short-term and long-term stores, linked by attention and rehearsal — a testable cognitive model.
Reconstruction
Recall rebuilds an event using existing knowledge, so gaps get filled and details shift.
Schema distortion
Schemas make us add expected details and drop inconsistent ones — a source of memory bias.
Stores · Rehearsal · Schemas
Take an eyewitness to a robbery. The multi-store model describes how they encoded and stored the event; but at recall, their schema of 'a robbery' fills gaps — they may confidently 'remember' a weapon that wasn't there. Memory is reconstructive, so it is vulnerable to bias. This is why measuring memory carefully matters.
Go further — higher-level insight: Reconstruction explains why confidence isn't accuracy. A witness can feel certain yet be wrong, because the schema-filled memory feels just as vivid as a true one. This has huge real-world importance for eyewitness testimony — a strong applied point.
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Key idea: A model is valuable when evidence can challenge it. A single patient showed that short-term memory is not one store.
Shallice and Warrington (1970) studied KF, whose short-term memory for heard words was very poor after brain damage, yet who could still learn new information into long-term memory.
What HL adds: Paper 3 sources often use case studies. Say what one case can disprove, and why it cannot prove a general rule on its own.
Key idea: Memory research is well-evidenced and applicable but relies on models and lab tasks.
Strengths and limitations
| Strengths and limitations | Strengths | Limitations |
|---|---|---|
| Models | Make invisible memory testable and predictable | Models oversimplify (memory is more than boxes) |
| Reconstruction | Strong evidence for schema-driven errors | Schemas hard to measure directly |
| Application | Explains eyewitness errors; improves justice | Lab word-list tasks may lack ecological validity |
So memory research offers a powerful, testable account and has real-world value (e.g. for eyewitness testimony), but a good evaluation notes models simplify, schemas are hard to measure directly, and some lab tasks are artificial. The reconstructive nature of memory is well-supported and practically important.
Watch out: Vivid ≠ accurate. A detailed, confident memory can still be a reconstruction. Never treat certainty as proof of accuracy.