Active Recall: Why Testing Yourself Beats Rereading
What is active recall and why does it beat rereading your notes? The research on the testing effect and simple ways to use retrieval practice daily.
6 min read
Rereading notes or textbook chapters before an exam is one of the most popular study habits there is. As you read, everything feels familiar and you think, "OK, I know this." The catch: on the exam nobody asks you to recognize the text. You have to produce the answer yourself.
Active recall (also called retrieval practice) means trying to pull information out of memory instead of reading it again. This guide covers what active recall is, why researchers consider it so powerful, and how to use it for any subject or exam.
What is active recall?
Active recall is any activity where you try to remember what you've learned without looking at the source. Quizzing yourself, using flashcards, doing practice questions, writing down everything you know about a topic on a blank page, or explaining it to a friend all count.
The key word is effort. Rereading is passive: your eyes move over lines that are already in front of you. Recalling forces your brain to rebuild the information. Research shows that this act of retrieval doesn't just measure what you know; it makes the information easier to retrieve next time. This is called the testing effect.
Why is active recall more effective than rereading?
One of the best-known studies here is Roediger and Karpicke (2006). Students studied short prose passages. Some reread the passages repeatedly; others read them once and then took recall tests (without feedback). A final test came 5 minutes, 2 days or 1 week later.
| Final test after | Which group did better? |
|---|---|
| 5 minutes | Students who reread |
| 2 days | Students who tested themselves |
| 1 week | Students who tested themselves |
The lesson: rereading looks better in the short term, but a few days later the self-testers remember substantially more. On top of that, the rereaders were more confident they would remember the material. Rereading is both less durable and misleadingly reassuring.
Feeling like you know something is not the same as being able to recall it. The surest way to check is to explain it without looking.
Isn't that just rote memorization?
A fair objection. Karpicke and Blunt (2011), published in Science, compared students who studied science texts by building concept maps with students who practiced retrieval. The retrieval group did better on a test one week later, including on inference questions that required understanding, and kept their advantage even when the final test itself was drawing a concept map.
At a larger scale, meta-analyses by Rowland (2014) and Adesope et al. (2017) confirm that practice testing generally beats restudying. Rowland's analysis also found that recall tests, where you generate the answer, produced larger benefits than recognition tests, where you only pick the right option.
How to practice active recall: 6 methods
| Method | How it works | Best for |
|---|---|---|
| Blank page (brain dump) | Close the book, write down everything you remember, then check what's missing | History, biology and other explanation-heavy topics |
| Flashcards | Question on the front, short answer on the back; say the answer before flipping | Definitions, terms, formulas, dates, vocabulary |
| Practice questions | Do problem sets and past papers; review every mistake | Math, physics, chemistry, reading comprehension |
| Write your own questions | Turn each heading into a question: "Why does mitosis matter?" | Lecture notes and textbook chapters |
| Teach it | Explain the topic out loud to a friend or to yourself | Concepts and cause-and-effect relationships |
| Recall from headings | Look only at section headings and recall what's underneath | Reviewing long units |
Tips to get the most out of active recall
- Answer first, then look. Always produce an answer before checking, even a guess. Peeking right away turns recall back into rereading.
- Check your answer. Compare with the source, correct anything wrong or missing, and try recalling it again.
- Struggle is normal. Difficulty doesn't mean you're studying badly; it's part of how learning happens.
- Prefer recall over recognition. Multiple choice helps, but open questions like "What is…?" or "Why does…?" demand more effort.
- Spread it out. Do your recall across several days, not in one go. We cover how the two combine in our guide to spaced repetition.
- Understand first. Quizzing yourself on something you never understood is just frustrating. Study it carefully once, then switch to recall.
Common active recall mistakes
- Flipping the flashcard immediately. The value is in the few seconds you spend thinking before you see the answer.
- Only practicing what you already know. It feels good but teaches you nothing new; the gains are where you struggle.
- Ignoring mistakes. Noticing an error and recalling the correct answer is the most instructive part of a test.
- Saving self-testing for the night before. Testing is a learning tool, not just a dress rehearsal. Use it throughout.
Active recall examples by subject
- Biology: Ask yourself "Where in the chloroplast do the light-dependent reactions happen?", answer, then check.
- History: After a chapter, close the book and write the events as a cause-and-effect chain.
- Math and physics: After reading a worked example, solve the same problem from scratch without looking.
- Literature: List the key features of a literary movement before checking your notes.
- Languages: See the word in your native language and recall the target-language word; then use it in a sentence of your own.
If turning notes into questions takes too long
Writing the questions is often the most tedious part of active recall. Recallow generates quiz questions and flashcards from the notes or PDF you upload, and because it shows key passages with page numbers, you can jump back to the right page when checking an answer. You still do the recalling; the app just cuts the prep work.
The bottom line
Rereading builds familiarity; active recall builds the ability to remember. In your next study session, swap part of your reading time for self-testing: close the book, write or say what you remember, then check. For a broader look at which methods hold up, read our overview of effective study techniques.
Frequently asked questions
What's the difference between active recall and rereading?
When you reread, the information is in front of you and you only recognize it. With active recall you retrieve it from memory without looking. Studies show rereading can look better in the short term, but a few days later people who tested themselves remember more.
Does active recall only work for memorization?
No. Karpicke and Blunt (2011) found retrieval practice outperformed concept mapping even on inference questions that required understanding. In subjects like math, solving problems without looking at the solution is also a form of active recall.
Do multiple-choice quizzes count as active recall?
Yes, they're a form of practice testing and they help. Meta-analyses suggest that questions where you generate the answer yourself tend to produce larger benefits, so mix both.
What should I do when I can't remember the answer?
Think for a moment, make a guess, then check the answer and try recalling it again a few minutes later. Failing to recall isn't failure; it tells you that item needs more review.
References
- Roediger, H. L. & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255. doi.org (opens in a new tab)
- Karpicke, J. D. & Blunt, J. R. (2011). Retrieval practice produces more learning than elaborative studying with concept mapping. Science, 331(6018), 772–775. doi.org (opens in a new tab)
- Karpicke, J. D. (2012). Retrieval-based learning: Active retrieval promotes meaningful learning. Current Directions in Psychological Science, 21(3), 157–163. doi.org (opens in a new tab)
- Rowland, C. A. (2014). The effect of testing versus restudy on retention: A meta-analytic review of the testing effect. Psychological Bulletin, 140(6), 1432–1463. doi.org (opens in a new tab)
- Adesope, O. O., Trevisan, D. A. & Sundararajan, N. (2017). Rethinking the use of tests: A meta-analysis of practice testing. Review of Educational Research, 87(3), 659–701. doi.org (opens in a new tab)