In one sentence
In 90-minute psychology seminars, 90-second pauses every 10 minutes produced higher end-of-class quiz scores than the usual one 10-minute break at 45 minutes — but attention still dropped toward the last slides in both setups.
What the researchers did
Sharpe, Trotter, and Hale studied 253 undergraduates on a second-year BSc psychology module at a UK university across 2021 (n = 97) and 2022 (n = 156), same tutor and slides. Ethics approval was retrospective; age and gender were not collected.
Over 10 weeks, four parallel 90-minute seminars ran each week (12 slides). Each week, two groups used micro-breaks and two used a traditional break; the assignment rotated so every group tried both. Traditional: one 10-minute break halfway. Micro-breaks: 90 seconds of anything except the material (eyes closed, quiet chat, stretch, water) every 10 minutes.
In the last 10 minutes, students took a multiple-choice quiz — one question per slide, in slide order — on their phones. The tutor logged the class percentage correct at each question, so the statistics largely track group accuracy over time, not each student’s personal score.
What they found
- Average quiz accuracy was higher with micro-breaks: 65.1% vs 56.4% (d = 1.78 in this analysis; ηp² = 0.77 for condition).
- Accuracy fell across the 12 questions in both conditions (81.3% → 55.6% micro-breaks; 82.5% → 51.5% traditional).
- Traditional classes rebounded right after the mid-session break (39.6% → 71.2% from question 6 to 7) then slipped again. Micro-breaks’ biggest edge was in the middle of the seminar (about 21 points on average across questions 3–6).
- The same pattern appeared in both years. By the last question both conditions were below 60%.
What this means for learners and educators
- A single coffee break is a brief reset, not a full-session shield. Short, regular off-task pauses may protect the middle of a long class.
- Put must-know points early; do not assume the last slide is remembered as well as the first, even with micro-breaks.
- Students can copy the idea in self-study: work in ~10-minute blocks with a 90-second look-away, rather than one long grind and one long rest.
Limitations and what we don't know yet
Quizzes were class percentages, so the huge d should not be read as a typical student-level effect. The module was psychology, one tutor, UK seminars. Students knew the study was about attention. Ethics were retrospective. Harder later slides could mimic a “vigilance drop.” No delayed exam. Micro-breaks were unstructured sitting pauses, not exercise videos (a different “brain breaks” literature).
FAQ
Do I need a 90-second timer every 10 minutes at home?
That was the classroom protocol. The safer takeaway is frequent short off-task pauses in a long sitting, not a magic interval.
Did micro-breaks stop scores from falling?
No. They raised the average and slowed the mid-session crash. The last questions were still weak.
Is this the same as retrieval practice?
The quiz was a summary check. The intervention itself was rest, not recall.