Retrieval Practice with Course Video: What the Research Shows (2026)

Retrieval practice with course video means pausing a lecture to make students recall what they just watched, and the research shows it improves long term retention more than rewatching and, in online lectures, also reduces mind wandering. This post walks through the key studies, what they did and did not test, and how to turn them into in video quizzes, spaced review and low stakes grading policies.

What is retrieval practice?

Retrieval practice is the act of pulling information out of memory, usually by answering a question, instead of putting it back in by rereading or rewatching. The benefit for later memory is often called the testing effect. A 2013 review of study techniques by John Dunlosky, Katherine Rawson, Elizabeth Marsh, Mitchell Nathan and Daniel Willingham in Psychological Science in the Public Interest gave practice testing and distributed practice the highest utility ratings, according to the Association for Psychological Science release.

In terms of the ICAP framework, a retrieval question moves a viewer from passive watching to at least active engagement, and an open question that asks for an explanation pushes toward constructive work.

What does the research show?

Testing beats restudying over days, not minutes

In Roediger and Karpicke (2006), published in Psychological Science, undergraduates read short prose passages and then either restudied them or took a free recall test with no feedback. According to the full paper, restudying won on a test five minutes later (81 percent versus 75 percent of idea units recalled). After two days the tested group recalled 68 percent versus 54 percent, and after one week 56 percent versus 42 percent.

A second experiment compared repeated studying with repeated testing. One week later, students who studied once and were tested three times recalled 61 percent, while students who studied four times recalled 40 percent. The repeated study group also predicted they would remember more. That gap between feeling and result matters for video: rewatching feels productive, but it is the weaker strategy for lasting memory.

Interpolated tests help in online lectures

The study closest to course video is Szpunar, Khan and Schacter (2013) in PNAS. Students watched a 21 minute introductory statistics lecture split into four segments of about five and a half minutes. After each segment, some students took a short quiz on that segment, while others did arithmetic or, in the second experiment, restudied the content.

In the second experiment, students who were tested between segments reported mind wandering on 19 percent of attention probes, compared with 39 percent for restudy and 41 percent for the untested group. They took notes on more slides and scored 90 percent on the final cumulative test, compared with 76 percent for restudy and 68 percent for the untested group. They also reported less anxiety about the final test.

Keep the limits in mind. The two experiments involved 80 students in total, one lecture and a lab setting, so the effect in a full course may differ. The direction of the findings, though, matches the wider testing literature.

Feedback makes multiple choice safer

Multiple choice is the most common in video question, and it carries a risk: students can remember a wrong option as true. Butler and Roediger (2008) in Memory and Cognition found that both immediate and delayed feedback increased correct answers on a later test and reduced the number of wrong options that resurfaced. The authors conclude that feedback should accompany multiple choice tests.

Spacing and the wider evidence

A meta analysis of distributed practice by Cepeda and colleagues (2006) in Psychological Bulletin covered 317 experiments and found that the best gap between study sessions grows as the time until the final test grows. A later meta analysis of practice testing by Adesope, Trevisan and Sundararajan (2017) in Review of Educational Research concluded that practice tests were more beneficial than restudying and the other comparison conditions they examined.

How do you apply retrieval practice to course video?

Quiz each segment, not just the end

Following the Szpunar design, place a short check after each meaningful segment, roughly every five to seven minutes, rather than one quiz at the end. One to three questions per break is enough. The goal is to interrupt drift before it starts.

Ask for recall, not recognition, when you can

Roediger and Karpicke used free recall, which asks students to produce the answer. Fill in the blank and short open questions are closer to that than multiple choice. Use multiple choice where it fits, but write options that reflect real errors and always attach feedback.

Explain the answer, then move on

Give feedback that says why an answer is right, not only whether it is. For a wrong answer, point students back to the timestamp where the idea was explained, or route them to a short review segment.

Space the review across videos

Reuse one or two questions from last week's video at the start of this week's. The Cepeda findings suggest that the longer you want students to remember something, the more you can stretch the gap between reviews. A question bank shared across a module makes this easy to maintain.

Keep the stakes low

Retrieval is a learning activity first. Count in video questions for completion or a small share of the grade, allow retries on practice items, and keep high stakes assessment separate. In the Szpunar study, the tested students reported less anxiety about the final test, which supports making frequent quizzing feel routine rather than threatening.

Tell students why you are doing it

Because restudying feels more effective than it is, students may resist pauses. A one line note at the start of the video, such as "these questions help you remember, not just check," sets expectations.

Where does Annoto fit?

If your video platform or LMS already supports quiz questions at timestamps with feedback, it may cover the basics here. Annoto's in video quizzes support multiple choice, multiple answer, true or false, open ended and fill in the blank questions, each with feedback, retries and optional time limits. A practice mode keeps scores out of the gradebook, branching can send students to a review segment after a wrong answer, and activities can be copied between courses for spaced reuse. Item level analytics show which questions students miss most. For placement patterns and a less research heavy introduction, see our earlier post on in video quizzes and active recall.

Key takeaways

• Testing beat restudying after two days and one week in Roediger and Karpicke (2006), even though restudying won after five minutes.
• Quizzes between segments of an online lecture reduced mind wandering and raised final test scores in Szpunar, Khan and Schacter (2013).
• Attach feedback to multiple choice questions to reduce the risk of students learning wrong options.
• Space review across videos and reuse earlier questions.
• Keep in video questions low stakes so they work as practice, not as a test.

Frequently asked questions

How often should I put questions in a lecture video?

The Szpunar study tested after segments of about five and a half minutes. A short check every five to seven minutes is a reasonable starting point for most lectures.

Do in video questions need to be graded?

No. In the studies above, the benefit came from answering the questions; Roediger and Karpicke's students did not even receive feedback. Low or no stakes grading keeps the focus on learning.

Is multiple choice good enough for retrieval practice?

It can help, especially with feedback, but questions that ask students to produce an answer are closer to the free recall used in the core studies. A mix works well.

For more on why passive viewing falls short, read why passive video does not teach. If you are weighing quiz tools, our Annoto vs PlayPosit comparison covers how two interactive video options differ.