Active recall — testing yourself on material without looking at your notes — produces significantly better long-term retention than passively rereading the same material, according to a substantial body of cognitive science research. The effect is sometimes called the "testing effect": the act of retrieving information from memory strengthens that memory more than restudying the same information does, even though rereading typically feels more comfortable and productive in the moment.
What the research actually found
The most cited demonstration of this comes from a 2006 study by Henry Roediger and Jeffrey Karpicke, published in Psychological Science. They had students study passages of text, then either restudy the passage again or take a practice test on it (recalling as much as they could without looking). On an immediate test, the restudy group actually did slightly better. But on a test given a week later, the group that had done practice testing outperformed the rereading group by a wide margin — the opposite of what most students would predict, and the opposite of what the restudy group's own confidence ratings predicted.
That gap — restudying feels more effective in the short term, while testing wins over any meaningful delay — is the core reason active recall is undervalued by students who judge their study methods by how confident they feel right after a session, rather than by what they can still produce days or weeks later.
A broader 2013 review by Dunlosky, Rawson, Marsh, Nathan, and Willingham evaluated ten common study techniques for evidence and classroom applicability. Practice testing (their term for active recall) was one of only two techniques — alongside distributed practice, or spacing reviews over time — rated as high utility, meaning it's backed by strong evidence, works across a range of subjects and learner types, and holds up outside the lab. Rereading and highlighting, by contrast, were both rated low utility: common, comfortable, but weakly supported by the evidence for actual retention gains.
Rereading and highlighting aren't harmful, but relying on them as your main review strategy is where students lose the most ground — the time feels well spent, and the material feels familiar, without a reliable signal of whether you could actually reproduce it on an exam.
Why rereading feels productive even when it underperforms
Part of the explanation is what researchers call processing fluency: the more times you've seen a passage, the more smoothly your brain processes it, and that smoothness gets misread as a sense of knowing the material. Highlighting adds a similar trap — marking a sentence as important feels like an active study behavior, but the actual cognitive work of retrieving or applying that information hasn't happened.
Active recall breaks this illusion because it's harder — closing the book and trying to reconstruct an idea from memory immediately reveals exactly what you don't yet know, which is uncomfortable in the moment but is precisely the information you need to study effectively.
Active recall vs. rereading: side-by-side
| Active recall (self-testing) | Rereading / highlighting | |
|---|---|---|
| What it requires | Retrieving information from memory without looking | Passively re-scanning material already on the page |
| Immediate feeling | Often feels harder, exposes gaps | Feels smooth, familiar, productive |
| Short-term test performance | Comparable or slightly lower | Can be slightly higher right after studying |
| Retention after days/weeks | Consistently higher in research | Drops off faster |
| Evidence rating (Dunlosky et al., 2013) | High utility | Low utility |
| Best used for | Reviewing material you've already been exposed to once | A first pass through brand-new material |
How to build active recall into your study routine
- Close-book summaries. After reading a section, close it and write down everything you remember, then check what you missed and reread only that part.
- Turn headings into questions. Before reading a chapter, convert each heading and subheading into a question. After reading, try to answer each one from memory.
- Practice problems without looking at examples. For math or science, attempt problems cold before checking worked examples — struggling productively before seeing the solution builds a stronger memory trace than reading the solution first.
- Self-generated flashcards. Writing your own questions (rather than only using pre-made decks) forces an extra round of retrieval and identifies exactly which concepts you understand well enough to quiz someone else on.
- Cornell-style cue columns. The Cornell note-taking method builds a self-testing cue column directly into your notes, so review sessions default to active recall instead of rereading.
- Explain it out loud, unaided. Explaining a concept from memory — to a study partner, or even to an empty room — surfaces gaps the same way writing does, and adds the extra step of having to organize the explanation coherently.
Active recall pairs naturally with spacing your reviews over time rather than cramming them into one sitting — see our guide on spaced repetition for how to schedule that, and effective study strategies for a higher GPA for how it fits into a broader routine. For a faster route to improving your GPA fast, swapping rereading for active recall in your weakest classes is one of the highest-leverage changes you can make. Track how it plays out with our GPA Calculator.
