Can blocked practice outperform interleaving for novice ECG learners?
Novice medical students did better after distributed instruction, while blocked practice outperformed interleaving on a delayed ECG interpretation test.
Source
Evaluating the effect of instruction and practice schedule on the acquisition of ECG interpretation skills
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%).
What they did
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.
What they found
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.
The limits
What it doesn't show
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.
Key terms
- Retention interval
- The time between the last learning opportunity and the outcome test.
- Comparison condition
- The alternative study activity or exposure against which a result is assessed.
- Generalisation
- Whether a result applies to other populations, materials, settings or outcomes.
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Quiz yourself
Which comparison was used in this study?
Common questions
Was interleaving always better?
No. Blocked practice performed better on the delayed novice ECG test.
Does this contradict the physics study directly?
The results limit a universal claim, but they used different learners, materials, instruction and assessments. They are not replications of the same task.
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