Learning
Can blocked practice outperform interleaving for novice ECG learners?
Open access · CC BY 4.0 · source: Europe PMC
Novice medical students did better after distributed instruction, while blocked practice outperformed interleaving on a delayed ECG interpretation test.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Newly covered practice-schedule studies show better delayed vocabulary recall after distributed sessions, better transfer after retrieval with feedback than plain rereading, and benefits of mixed physics homework on surprise tests. Their comparisons and outcomes differ, so they do not justify a single universal learning gain.
Scope note — Novice ECG interpretation favoured blocked over interleaved practice.
Limits the claim's scope: a different population, assay, or outcome.
The spacing finding extends to a complex learning task, but not without design limits.
Novice ECG learners scored higher after instruction distributed over consecutive weeks than after one massed session on a delayed test, but attrition, schedule switches and unequal delays limit the comparison.
Evidence for the claim as stated.
The studies use different intervals, materials and tests: word-pair recall over days and weeks, novice diagnostic interpretation, and course-end exams. They do not yield one optimal spacing interval or one pooled gain.
Evidence for the claim as stated.
The novice ECG result limits a blanket claim that mixing always helps.
For novice ECG interpretation, blocked practice outperformed interleaving on the delayed test. The study had attrition and partly non-random allocation, so it is a scope-limiting example rather than a universal reversal of interleaving benefits.
Evidence for the claim as stated.
Physics problem-solving favoured interleaving on surprise tests, whereas novice ECG interpretation favoured blocked practice. Different learners, tasks, instruction and delays mean these are scope differences rather than conflicting replications of one experiment.
Evidence for the claim as stated.
The object-colour benefits came from final tests within a single session, whereas classroom studies assessed learning after longer delays. These outcome windows cannot be treated as interchangeable.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
The studies use different intervals, materials and tests: word-pair recall over days and weeks, novice diagnostic interpretation, and course-end exams. They do not yield one optimal spacing interval or one pooled gain.
Physics problem-solving favoured interleaving on surprise tests, whereas novice ECG interpretation favoured blocked practice. Different learners, tasks, instruction and delays mean these are scope differences rather than conflicting replications of one experiment.
The object-colour benefits came from final tests within a single session, whereas classroom studies assessed learning after longer delays. These outcome windows cannot be treated as interchangeable.
History
When this study was placed
Dated entries from the concept change log — when this paper was added or removed as support, challenge, or qualifier on a claim.
Placed as a scope qualifier on Learning
Newly covered practice-schedule studies show better delayed vocabulary recall after distributed sessions, better transfer after retrieval with feedback than plain rereading, and benefits of mixed physics homework on surprise tests. Their comparisons and outcomes differ, so they do not justify a single universal learning gain.
Study at a glance
- Design
- Human experiment — 2×2 factorial intervention; initially random allocation with four schedule switches
- N
- N=51 · 80 enrolled; 70 completed all modules; 51 completed delayed test
- Population
- First-year medical students at McMaster University without prior ECG training
- Outcome
- Immediate module quizzes and delayed cumulative ECG interpretation quiz
- Comparison
- Distributed versus massed instruction, independently crossed with blocked versus interleaved practice
- Test delay
- Delayed test 3–5 weeks after instruction; delay varied between participants
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
Can blocked practice outperform interleaving for novice ECG learners?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Who participated and how large was the analysed sample?
A further 19 students did not complete the delayed retention test.
What was the main finding?
The mean percent correct on the final test for blocked practice was 34% (95% CI 27–40%) and for interleaved practice 24% (95% CI 18–29%).
Key findings
On the delayed test, mean scores were 34% after distributed instruction versus 24% after massed instruction. Independently, blocked practice averaged 34% versus 24% after interleaved practice. There was no significant interaction between instruction and practice schedules. Immediate module tests favoured distributed instruction overall but did not show a practice-order effect. These results limit claims that interleaving is always superior.
Methodology
Eighty first-year medical students entered a two-by-two study of instruction spacing and practice order. Initial assignment was random, but four students switched schedules. Instruction covered three ECG modules either in one session or across consecutive weeks; practice examples were blocked by diagnosis or interleaved. Seventy students completed all modules and 51 took the delayed cumulative test, scheduled three to five weeks after instruction.
Limitations
Attrition was substantial, assignment became partly non-random, and delays varied; some massed-instruction students waited longer before testing. No objective baseline ECG skill assessment was taken, and scores were low overall. The result concerns novices learning complex ECG interpretation, not experienced clinicians or all learning domains. It does not establish a general mechanism for why blocked practice helped.
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