Two subsets of rational-number CCS items demand working memory capacities of 4 or 5 units respectively¶
Claim · All claims
Evidence · 1 study · associationalr2·q3
Currency · newest study 2019 · not yet checked against its sources · not reviewed by a person
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? Study II identified two subsets of items demanding a working memory capacity of 4 or 5 units, respectively. → Morra 2019
Evidence¶
Morra 2019¶
Morra, S.; Bisagno, E.; Caviola, S.; Delfante, C.; Mammarella, I. C. (2019). Working Memory Capacity and the Development of Quantitative Central Conceptual Structures. Cognition and Instruction. https://doi.org/10.1080/07370008.2019.1636797
q3 · i? · associational · r2
In Study II with 92 sixth- and seventh-graders, item analysis identified "2 subsets of items that demand a capacity of 4 or 5 units, respectively." This links specific rational-number item demands to working memory capacity units.
"We also identified 2 subsets of items that demand a capacity of 4 or 5 units, respectively."
Discussion¶
Related Claims¶
- Rational-number CCS test performance is predicted by working memory capacity and, to a lesser extent, by intrusion errors in the listening span — related
- Children's understanding of whole number advances by one developmental level per additional unit of working memory capacity — related
- Chunking reduces working memory load by grouping information into fewer, more meaningful units. — related
- Hippocampal malleability from resource-demand mismatch implies students benefit most from challenges matched to individual capacity — related
- A shared attentional resource for storage and processing is the best supported resource theory of WM capacity but faces empirical challenges — a broader claim this one bears on
- People can selectively remove no-longer-relevant information from WM, but removal of an arbitrary subset of items is inefficient — related
- Short-term storage capacity increases from two units at ages 3-4 to four units at ages 10-11 when executive operations are minimal — related
- Cognitive Load Theory has traditionally used slot-based working memory capacity models — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
rational-number-item-subsets-capacity-demands |
title |
Two subsets of rational-number CCS items demand working memory capacities of 4 or 5 units respectively |
description |
Two subsets of rational-number CCS items demand working memory capacities of 4 or 5 units respectively |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2019 |
generated |
by process:wiki-ingest on 2026-10-18 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — morra-2019 |
Frontmatter is the page's machine-readable record — see the Schema & Guide.