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2 references
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- Vol 1 TE: App A
working memory capacitychunkingattention limitslong-term memoryinterferencerehearsalindividual differencesBook Evidence summaryAt a glance
Cowan’s book examines why working memory—the small amount of information kept readily accessible for current thought—has a sharply limited capacity.
Key ideas
It distinguishes this limit from long-term memory, sensory persistence, rehearsal, and strategies such as grouping items into meaningful chunks. Across behavioural evidence and competing theories, Cowan argues that a central focus of attention typically holds about three to four independent chunks in young adults. Apparent variation in span can arise because tasks differ in chunking, prior knowledge, interference, rehearsal opportunities, and measurement methods. The book compares item-limit, time-based, interference, attentional, biological, and evolutionary explanations and considers how capacity relates to comprehension, reasoning, learning, development, and individual differences.
Why it matters
Its practical lesson is not a simplistic rule about presenting exactly four items; instruction should reduce unnecessary simultaneous demands, connect new material with established knowledge, allow consolidation and retrieval, and recognise that meaningful organisation changes what counts as a chunk.
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- Vol 4 RE: Chapter 3
- Vol 4 TE: App C
- Vol 7 PE: App D
working memory limitsmeaningful chunkingconcurrent processingneural interferenceschema developmentattention guidancepractice sequencingJournal article Evidence summaryAt a glance
Cowan reviews the proposal that working memory contains a central store limited to roughly three to five meaningful items in young adults.
Key ideas
This relatively stable limit must be distinguished from performance on immediate-memory tasks, which can be altered by rehearsal, chunking, sensory memory, long-term knowledge, and the amount of concurrent processing. The article explains how researchers isolate the central limit, why estimates differ among individuals and across development, and several possible reasons a limit exists, including neural representation, interference, and the need to bind elements without confusion. Capacity matters because complex cognition requires information to remain available while it is combined, compared, or transformed. Educationally, the account supports reducing avoidable concurrent demands and helping learners organise knowledge, but it does not imply that every lesson should contain only four facts.
Why it matters
Meaningful chunks depend on expertise, and well-designed instruction expands effective performance by building schemas, guiding attention, and sequencing practice.
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Edition abbreviations
- TE
- Teacher Edition
- PE
- Practice Edition
- RE
- Research Edition
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References are checked against publisher records, scholarly indexes, DOI or ISBN metadata, repositories and author records where available. An entry marked [Citation not verified] preserves the wording found in the relevant volume without attributing findings to an unconfirmed work.
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