Active Recall: What It Is and How to Use It to Study

By Daniel · 28 September 2026 · 11 min read

Active recall is studying by pulling information out of your memory instead of putting it back in: you close the notes and answer a question, then check. It is one of the two best-supported study methods in memory research, alongside spacing your reviews out. In one classic experiment, students who spent their study time recalling a passage remembered 61% of it a week later, against 40% for students who read it four times.

What is active recall?

Active recall, also called retrieval practice or the testing effect, is any study method where you produce the answer yourself. You look at a question, a prompt or a blank page, and you bring the material back from memory before you check it.

The opposite is passive review: rereading a chapter, going over highlighted lines, watching a lecture again. Passive review puts the information in front of you. Active recall makes you go and get it.

A simple test tells the two apart. If the answer is visible while you are “studying” it, the method is passive. If you have to cover it, close it or put it away first, the method is active.

That makes the idea sound small, and it is. What makes it worth a whole guide is how much difference it makes, and how few students use it. When researchers asked 177 college students to list the strategies they used to study, only 11% listed testing themselves. Rereading was the most common answer.

Active recall vs rereading: what the research shows

The best-known study is Roediger and Karpicke’s, published in Psychological Science in 2006. In its main experiment, students studied a short prose passage under three schedules, each made of four study periods (S) or recall tests (T), and were tested again five minutes or one week later.

Two things stand out. After five minutes the rereaders were ahead, which is why cramming feels as if it works. And the rereaders were the most confident they would remember the passage, even though a week later they remembered the least.

The findings have held up across hundreds of studies since:

• Karpicke and Roediger, 2008 (Science). Students learned 40 Swahili–English word pairs. Pairs that stayed in the practice tests after being recalled once were remembered about 80% of the time a week later. Pairs that were dropped from testing, but still studied, fell to about a third.
• Karpicke and Blunt, 2011 (Science). Practicing recall of a science text beat building a concept map of it, including on a final test that asked students to draw concept maps.
• Dunlosky and colleagues, 2013. A review of ten common study techniques rated practice testing and spaced practice as the only two with high utility. Rereading, highlighting and summarizing were rated low.
• Adesope, Trevisan and Sundararajan, 2017. A meta-analysis of 217 studies found that practice testing beat restudying the same material, with a moderate effect, and beat unrelated filler activities by much more. Multiple-choice practice tests helped too.

Why active recall works

Retrieving a memory changes it. Each time you pull something out of memory, you strengthen the route back to it. Reading the same fact again does much less, because you never have to find it. This is why the students in the 2008 study kept their words when they kept being tested on them, and lost them when they only kept reading them.

Effort is a feature. Psychologists call this a desirable difficulty. An answer that takes a few seconds of work to reach is better learned than one that arrives instantly. That is also why active recall feels harder and slower than rereading, and why students tend to abandon it for something that feels smoother.

It shows you what you don’t know. Rereading a page you have seen before feels familiar, and familiarity is easy to mistake for knowledge. A question you cannot answer is unambiguous. Every miss is a note of exactly what to study next, which rereading never gives you.

It practices the thing the exam asks for. An exam is an act of recall. Studying by recall means rehearsing the same act, under similar pressure, before it counts.

Recognition is not recall

There are two ways to know something. Recognition is knowing the answer when you see it. Recall is producing it with nothing in front of you.

Rereading trains recognition. That is why notes can feel fully learned while you read them and then vanish in the exam hall, where the page is blank.

Recognition still has a place. Multiple-choice questions are a gentle start for material you have only just met, and the 2017 meta-analysis found they help. But they should not be where you stay. Move up to questions where you have to write or say the answer: short answers, fill-in-the-blank, explaining a diagram from memory, working a problem without the worked example open.

A useful rule is to make the question harder as the answer gets easier. When a card stops costing you effort, it has stopped teaching you much in its current form.

7 active recall techniques

You do not need a special tool to use active recall. These all work with a notebook and a closed book.

1. Flashcards. A question on one side, the answer on the other. The rule is to answer before you flip, out loud or on paper, and to be honest about whether you got it. A card you “sort of knew” counts as a miss.
2. Blurting. Read a section, close it, and write down everything you remember on a blank page. Then open the notes and fill the gaps in a different color. The colored parts are next session’s work.
3. Practice questions and past papers. The closest thing to the real exam. Do them closed-book and timed, mark them properly, and turn every mistake into a flashcard.
4. Teach it. Explain the topic aloud to a friend, a pet or an empty room, without notes, as if to someone who has never heard of it. Where you stall or wave your hands is where your understanding is thin. This is the core of the Feynman technique.
5. Question-based notes. Write your notes as answers to questions, with the questions in the margin, as in the Cornell method. To review, cover the notes and answer the margin.
6. Draw it from memory. Sketch the diagram, timeline, process or mind map without looking, then compare it with the original. This works well for anatomy, cycles in biology and anything with a structure.
7. Let an app write the questions. The slowest part of active recall is writing good questions. A quiz or flashcard app can make them from your notes and ask them on a schedule, so the time goes into answering instead.

How to make flashcards for active recall

Most flashcards fail before they are ever studied, because they are written as reminders rather than questions. A few rules fix most of it.

• Ask a question, not a topic. “Krebs cycle” on the front is a prompt to reread. “Where in the cell does the Krebs cycle happen?” is a question you can get right or wrong.
• One fact per card. If the back has a list of six things, you will remember four and mark the card correct. Split it into cards you can pass or fail cleanly.
• Use your own words. Rewriting the textbook sentence into a question forces you to understand it first.
• Make it work both ways. For terms and definitions, languages and dates, add a reverse card. Knowing that A means B does not guarantee you can get from B to A.
• Ask why, not just what. “Why does blood pressure fall when arteries dilate?” teaches more than a card that only asks for the definition.
• Keep the ones that hurt. Do not delete a card because it keeps beating you. Rewrite it smaller, or add a card that builds up to it.

Active recall and spaced repetition

Active recall answers how to study. Spaced repetition answers when.

Memory fades on a curve: fast at first, then slower. Spaced repetition schedules each review for the moment just before you would forget, so each successful recall is an effortful one and pushes the next review further out. Cards you know drift to weeks and months apart. Cards you miss come back tomorrow.

The two work best together, and the 2013 review rated them the two most useful techniques it examined. Recall without spacing turns into cramming. Spacing without recall is just rereading on a timetable.

You can space by hand with a box of paper cards moved between sections, often called the Leitner system. Most students now let software do it. Anki has used spaced repetition for years and added FSRS, a newer scheduling algorithm, in version 23.10. Many flashcard apps now schedule reviews in a similar way.

A 30-minute active recall session

A plan for one topic, one sitting, that you can reuse every day of revision:

1. Minutes 0 to 5: blurt. Before opening anything, write down all you remember about the topic from last time. It is a warm-up and a diagnosis at once.
2. Minutes 5 to 20: questions. Work through your due flashcards or a set of practice questions. Answer each one fully before checking. Mark every miss.
3. Minutes 20 to 25: fix the misses. Now open the notes, but only for what you got wrong. Reread those parts, then close the notes and try again.
4. Minutes 25 to 30: write tomorrow’s questions. Turn each miss into a new card or question, so the next session starts where this one found the gaps.

Then stop. A second short session on another day will do more than doubling this one, because the forgetting in between is what makes the next recall effortful.

Common active recall mistakes

• Peeking too soon. Flipping the card after a second is recognition with extra steps. Give yourself a real attempt, even a wrong one, before you check.
• Dropping cards after one right answer. This is the finding of the 2008 study. Getting it right once is where retention starts, not where it ends.
• Staying on multiple choice. It is a fine first step and a poor last one. Move to typed or spoken answers as a card gets easier.
• Skipping the check. Recall without feedback lets mistakes set. Always compare your answer with the source, and fix the ones you got wrong.
• Cards that are too big. A card with a paragraph on the back cannot be failed honestly. Split it.
• Cramming all of it into the last night. Recall helps any time, but its effect on the exam comes from spreading it over days.
• Going back to rereading because it feels better. It will feel better. That feeling is the one the 2006 students had, and it is not a guide to what you will remember.

Active recall in Memrize

We make Memrize, so weigh this section accordingly. It is an app built around the methods above, and this is what it does, not a claim about your grades. How we write these guides is on our About page.

You give it your material: photos of your notes, a PDF or slides, a pasted text, a YouTube lecture or a recording. It writes a deck of cards and, for each card, several kinds of question from the same material.

3 in a row

524

New card

Which organelle produces most of a cell’s ATP?

Ribosome

Mitochondrion

Golgi apparatus

Lysosome

Nice!

+7 XP · 3 in a row

Explain

Continue

Then it runs the session the way this guide recommends:

• A new card is taught once, then asked two steps later, so the answer has to be recalled, not echoed.
• Questions start as multiple choice and get harder. As a card gets stronger they move to typed recall, fill-in-the-blank, true or false and reverse questions, and never the same format twice in a row.
• A miss shows the explanation, then comes back five steps later in an easier format, until you get it right.
• Nothing is dropped after one right answer. Every review is scheduled by FSRS, aiming for 90% recall, or 95% if you set an exam date.
• Sessions are 5, 10 or 20 cards, with due reviews first, so a daily session fits in a few minutes.

The free plan keeps three decks at a time and makes up to three AI decks a day. Plus lifts those limits.

Sources

• Roediger, H. L., and Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
• Karpicke, J. D., and Roediger, H. L. (2008). The critical importance of retrieval for learning. Science, 319(5865), 966–968.
• Karpicke, J. D., and Blunt, J. R. (2011). Retrieval practice produces more learning than elaborative studying with concept mapping. Science, 331(6018), 772–775.
• Karpicke, J. D., Butler, A. C., and Roediger, H. L. (2009). Metacognitive strategies in student learning: Do students practise retrieval when they study on their own? Memory, 17(4), 471–479.
• Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., and Willingham, D. T. (2013). Improving students’ learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58.
• Adesope, O. O., Trevisan, D. A., and Sundararajan, N. (2017). Rethinking the use of tests: A meta-analysis of practice testing. Review of Educational Research, 87(3), 659–701.

Questions students ask