Evidence for Retrieval practice: testing yourself to learn #

Every substantive claim on the Retrieval practice: testing yourself to learn page is checked against current research. Here is each claim, how well today’s evidence supports it, and the sources. The full, de-duplicated source list lives on the references page.

Supported · strong evidence — Retrieving information from memory (self-testing) produces stronger long-term retention than spending the same time restudying or rereading the material (the testing effect).

Roediger & Karpicke’s classic demonstration that testing beats restudy on delayed retention has been replicated extensively; it is a cornerstone of the science of learning and routinely reproduced across materials and populations.

Supported · strong evidence — On an immediate test rereading can match or slightly beat retrieval practice, but after a delay of days the retrieval-practice advantage emerges and grows, so immediate ease misleads.

The crossover whereby restudy looks better immediately but testing wins at a delay is a well-documented and repeatedly observed feature of the testing-effect literature, illustrating the learning-versus-performance distinction.

Sources: Roediger & Karpicke (2006), Test-Enhanced Learning: Taking Memory Tests Improves Long-Term Retention, Psychological Science — https://journals.sagepub.com/doi/10.1111/j.1467-9280.2006.01693.x · Soderstrom & Bjork (2015), Learning Versus Performance: An Integrative Review, Perspectives on Psychological Science — https://journals.sagepub.com/doi/10.1177/1745691615569000 · full reference ›

Supported · strong evidence — The benefit of practice testing over restudy is robust across subject matter, age groups, and test formats, as shown by meta-analysis of many comparisons.

Adesope, Trevisan & Sundararajan’s meta-analysis of hundreds of effects found a moderate-to-large, broadly generalisable testing benefit, consistent with Rowland’s independent meta-analytic review.

Sources: Adesope, Trevisan & Sundararajan (2017), Rethinking the Use of Tests: A Meta-Analysis of Practice Testing, Review of Educational Research — https://journals.sagepub.com/doi/10.3102/0034654316689306 · Rowland (2014), The Effect of Testing Versus Restudy on Retention: A Meta-Analytic Review, Psychological Bulletin — https://doi.org/10.1037/a0037559 · full reference ›

Supported · strong evidence — Practice testing is among the highest-utility study techniques, whereas rereading and highlighting—the most common student strategies—are rated low-utility.

Dunlosky et al.’s comprehensive review rated practice testing (and distributed practice) as high-utility and rereading, highlighting and summarisation as low-utility; this ranking remains the standard reference and is widely endorsed.

Sources: Dunlosky, Rawson, Marsh, Nathan & Willingham (2013), Improving Students’ Learning With Effective Learning Techniques, Psychological Science in the Public Interest — https://journals.sagepub.com/doi/10.1177/1529100612453266 · full reference ›

Supported · moderate evidence — Rereading increases the subjective feeling of fluency or familiarity, which inflates confidence out of step with actual later memory, producing an illusion of competence.

It is well established that processing fluency from rereading inflates judgments of learning relative to real retention; learners systematically overrate easy, fluent study experiences such as rereading.

Sources: Koriat & Bjork (2005), Illusions of Competence in Monitoring One’s Knowledge During Study, Journal of Experimental Psychology: LMC — https://bjorklab.psych.ucla.edu/wp-content/uploads/sites/13/2016/07/Koriat_Bjork_2005.pdf · Dunlosky, Rawson, Marsh, Nathan & Willingham (2013), Improving Students’ Learning With Effective Learning Techniques, Psychological Science in the Public Interest — https://journals.sagepub.com/doi/10.1177/1529100612453266 · full reference ›

Supported · moderate evidence — Retrieval practice can produce more learning, including on inference and knowledge-application questions, than elaborative studying such as concept mapping.

Karpicke & Blunt’s Science study showing retrieval practice outperformed concept mapping, including on inference questions, is widely cited and broadly replicated, though exact effect sizes vary with materials and how each activity is implemented.

Sources: Karpicke & Blunt (2011), Retrieval Practice Produces More Learning Than Elaborative Studying With Concept Mapping, Science — https://doi.org/10.1126/science.1199327 · full reference ›

Supported · strong evidence — Retrieval is not merely an assessment of existing memory; the act of successfully recalling information itself strengthens and consolidates that memory for future access.

The view that retrieval is a memory-modifying (‘memory is a process’) event rather than a neutral readout is well supported; the act of recall reliably enhances later retention of the retrieved item.

Sources: Roediger & Karpicke (2006), The Power of Testing Memory: Basic Research and Implications for Educational Practice, Perspectives on Psychological Science — https://journals.sagepub.com/doi/10.1111/j.1745-6916.2006.00012.x · Karpicke & Roediger (2008), The Critical Importance of Retrieval for Learning, Science — https://doi.org/10.1126/science.1152408 · full reference ›

Supported · moderate evidence — Pairing retrieval attempts with corrective feedback improves learning, and feedback is especially important for correcting errors so wrong answers are not simply rehearsed.

Feedback reliably augments the testing effect—particularly by correcting errors and protecting against retention of wrong responses—and meta-analytic and review evidence shows tests with feedback generally outperform tests without it.

Sources: Rowland (2014), The Effect of Testing Versus Restudy on Retention: A Meta-Analytic Review, Psychological Bulletin — https://doi.org/10.1037/a0037559 · Adesope, Trevisan & Sundararajan (2017), Rethinking the Use of Tests: A Meta-Analysis of Practice Testing, Review of Educational Research — https://journals.sagepub.com/doi/10.3102/0034654316689306 · full reference ›

Supported · strong evidence — Because effortful recall during study depresses immediate performance while improving durable retention, in-session ease is an unreliable guide to how much has actually been learned.

Soderstrom & Bjork’s distinction between performance and learning is foundational and widely accepted; retrieval practice is a paradigm case of a desirable difficulty that lowers current performance yet raises long-term learning.

Sources: Soderstrom & Bjork (2015), Learning Versus Performance: An Integrative Review, Perspectives on Psychological Science — https://journals.sagepub.com/doi/10.1177/1745691615569000 · full reference ›