Retrieval practice: how it improves long-term learning

Retrieval practice is a well-known learning method, and one of the most robust findings in cognitive psychology. It helps students study more effectively by recalling information already stored in long-term memory, which strengthens long-term retention. It is straightforward, easily implemented, and can greatly improve learning, because:

1. Trying to recall a memory can modify, reorganise, and consolidate it better in our long-term memory.
2. Trying to recall something creates new retrieval pathways to that memory, making it easier to retrieve later on.
3. By searching for a memory, we tend to activate information connected to it. This links it in a more networked and organised structure for easier future access.

This is also the foundation of active recall, a study technique build around the same principle. It works hand in hand with spaced repetition and the testing effect.

How does retrieval practice work?

“Calling information to mind” means bringing it into our working memory. So, to understand retrieval practice, we have to understand how memories are made, which was the topic of a previous article.

In short, we create long-lasting memories by linking new information (in our working memory) to knowledge we already possess (in our long-term memory), a process called active learning. Practicing active memory retrieval can improve memory and boost learning.

Cognitive psychologists have found that, instead of highlighting parts of a text or taking notes, students can improve memory and learning more effectively through retrieval practice. In essence, after reading new material for the first time, students try to recall the most important information it contained without looking at either the text or their notes. Once they have completed the retrieval, they check the material for feedback on how accurate and complete their retrieval was.

Trying to recall information may sound more difficult than re-reading a text or looking at notes, which it is, but that very struggle to recall is what improves our memory. Here are 4 reasons why:

1. The act of retrieving a memory modifies it. When we try to remember something, we’re not choosing from a selection of existing memories. Instead, we piece it together from the memory traces that constituted it when it was originally created. This struggle to retrieve and reassemble a memory usually strengthens it.
2. By searching for a memory without the help of external triggers  like notes or a text, we are creating a new retrieval pathway to find that memory. That way, we won’t need any external triggers to find this information the next time.
3. When searching for a memory, we are also likely to retrieve related information. This can help organise memories and link them in ways that might make it easier to retrieve them later on.
4. When we fail to retrieve the intended information, this failure can be useful. It shows which information requires additional studying, to further strengthen the memory and make it more likely to be retrieved in the future. Retrieving memories is more powerful than re-reading notes or passages, mainly because when re-reading our notes, the retrieval cues come from external sources. In other words, less effort is required to find the information. This ease of recognition makes us feel like we are learning more, when we are actually learning less, especially in the long-term.

The science behind retrieval practice

Retrieval practice is one of the most studied techniques in cognitive psychology. In a landmark study, Roediger and Karpicke showed that taking a practice test, rather than simply re-reading, dramatically improves long-term retention. This effect is known as the testing effect (or test-enhanced learning). Later work by Karpicke and Roediger confirmed that the act of retrieval itself, not just extra exposure, is what drives durable learning.

Cognitive psychologists such as Pooja K. Agarwal have since translated this research for classrooms, showing that frequent, low-stakes quizzes help students learn more than high-stakes exams alone. A major review by Dunlosky and colleagues ranked practice testing among the most effective learning techniques available, across subjects and age groups. It works from primary school to medical school, where retrieval practice is now widely used to prepare for board exams.

The takeaway: retrieval practice isn't a study hack, it's an evidence-based method backed by decades of research on memory and learning.

Retrieval practice examples and techniques

There are many forms of retrieval practice, and most take only a few minutes. Some of the most effective include:

• Free recall (brain dump): after a lesson, students write down everything they can remember on a blank page, then check it against their notes for feedback.
• Practice questions and low-stakes quizzes: short, ungraded quizzes that prompt students to retrieve key ideas — the most classic form of retrieval practice.
• Flashcards: question on one side, answer on the other. Tools like Wooflash turn flashcards into spaced, self-paced retrieval practice.
• Two-column method: fold a page, write cues on one side, recall the details on the other.
• Peer quizzing: students test each other, which adds retrieval plus explanation.
• Past-paper and exam-style practice: retrieving under realistic conditions before the real exam.

The common thread: the learner produces the answer from memory first, then gets feedback — that effortful retrieval is exactly what strengthens learning.

Retrieval practice as low-stakes assessment (and where it works best)

Retrieval practice works best as low-stakes assessment: frequent, low-pressure checks that turn testing from a judgment into a learning tool. This shift is often called assessment for learning. Keeping stakes low (little or no grade) encourages students to retrieve often, without the anxiety tied to high-stakes exams.

It fits almost any context: a quick quiz at the start of a class to recall last week's lesson, a brain dump in a university lecture, flashcards for self-study, or regular practice questions in medical school and professional training. Because it needs nothing more than a question and a moment to think, retrieval practice scales from a single learner to a full classroom or training room.

How to use retrieval practice effectively

• First, it is important for students to receive feedback about the accuracy and completeness of their retrieval practice. That feedback can come from the teacher, classmates, or the course material.
• Retrieval practice should not be graded, to encourage students to use this learning method whenever they can, rather than linking it to stress and performance anxiety. As students become used to and confident in retrieving what they know from their memory, retrieval practice can even reduce anxiety.
• Students must have something in memory to retrieve in the first place. They need to know how to create durable memories while studying, and make sense of new information by using their prior knowledge and clues from course materials.
• Effective retrieval practice is difficult and involves struggle. Students need to know that this struggle is beneficial, because it means that learning is taking place.

FAQ

What is retrieval practice?

Retrieval practice is a learning method that involves recalling information from memory instead of re-reading or highlighting. This effortful recall is what strengthens long-term retention. It's one of the best-supported techniques in cognitive psychology.

Why is retrieval practice effective for learning?

Each time you retrieve a memory, you reshape and reinforce it, create new pathways to find it again, and surface gaps to study next. This effortful recall (the testing effect) builds far more durable learning than passive review.

What are examples of retrieval practice?

Free recall or brain dumps, practice questions, low-stakes quizzes, flashcards, the two-column method, peer quizzing, and exam-style practice are all common forms of retrieval practice.

How can students and teachers use retrieval practice?

Replace some re-reading with short, ungraded recall: a quiz at the start of class, flashcards between sessions, or a brain dump after a lecture. Just make sure each one is always followed by feedback.

Is retrieval practice the same as spaced repetition?

No, but they pair well. Retrieval practice is about recalling from memory; spaced repetition is about timing those retrievals across increasing intervals. Used together, they maximise long-term retention.

What does research say about its long-term benefits?

Studies by Roediger, Karpicke, Agarwal and others consistently show large gains in long-term retention versus re-reading. The effect holds across subjects, ages, and settings, from school to medical training.

References

• Roediger, H. L., III, & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255. DOI: 10.1111/j.1467-9280.2006.01693.x
• Karpicke, J. D., & Roediger, H. L., III (2008). The critical importance of retrieval for learning. Science, 319(5865), 966–968. DOI: 10.1126/science.1152408
• Roediger, H. L., III, & Butler, A. C. (2011). The critical role of retrieval practice in long-term retention. Trends in Cognitive Sciences, 15(1), 20–27. DOI: 10.1016/j.tics.2010.09.003
• Kang, S. H. K., McDermott, K. B., & Roediger, H. L., III (2007). Test format and corrective feedback modify the effect of testing on long-term retention. European Journal of Cognitive Psychology, 19(4–5), 528–558. DOI: 10.1080/09541440601056620
• Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58. DOI: 10.1177/1529100612453266
• Agarwal, P. K., & Bain, P. M. (2019). Powerful Teaching: Unleash the Science of Learning. Jossey-Bass. (voir aussi retrievalpractice.org)
• The Science of Learning — What Every Teacher Should Know, EdX: https://www.edx.org