Chapter 8 Further Reading: Spaced Repetition

Foundational Research

Ebbinghaus, H. (1885/1913). Memory: A Contribution to Experimental Psychology (H. A. Ruger & C. E. Bussenius, Trans.). Dover Publications. The original work. Not easy reading, but historically remarkable. The forgetting curve and spacing effect data are right here, observed by a single scientist studying himself over years. A free English translation is available at Project Gutenberg.

Cepeda, N. J., Pashler, H., Vul, E., Wixted, J. T., & Rohrer, D. (2006). "Distributed practice in verbal recall tasks: A review and quantitative synthesis." Psychological Bulletin, 132(3), 354–380. A rigorous meta-analysis covering more than 800 experiments on the spacing effect. The most comprehensive synthesis of the spacing literature. Technical but important for anyone who wants to understand the depth of the evidence.

Bjork, R. A., & Bjork, E. L. (1992). "A new theory of disuse and an old theory of stimulus fluctuation." In A. Healy, S. Kosslyn, & R. Shiffrin (Eds.), From Learning Processes to Cognitive Processes: Essays in Honor of William K. Estes (Vol. 2, pp. 35-67). The New Theory of Disuse — storage strength vs. retrieval strength — is introduced here. Dense academic reading, but the distinction is foundational for understanding why spacing works.

Accessible Books

Make It Stick: The Science of Successful Learning by Peter C. Brown, Henry L. Roediger III, and Mark A. McDaniel. The best book for a general reader who wants to understand spaced repetition alongside related strategies. Strong on both the evidence and practical application.

Moonwalking with Einstein: The Art and Science of Remembering Everything by Joshua Foer. A fascinating exploration of memory through the author's journey into competitive memorization. Not specifically about spaced repetition but excellent for understanding how memory works and can be cultivated.

Fluent Forever: How to Learn Any Language Fast and Never Forget It by Gabriel Wyner. The most practical guide to language learning through spaced repetition. Covers vocabulary acquisition, card design for language learners, and how to integrate SRS with other language learning methods.

The Anki Ecosystem

Anki Manual (apps.ankiweb.net/docs/manual.html) The official documentation. Dry, but the sections on card types, scheduling, and statistics repay close reading.

Augmenting Long-term Memory by Michael Nielsen (mnemonic.medium.com) A lengthy essay by a physicist about using Anki seriously, including deep thinking about what's worth encoding and how to design cards that build genuine understanding rather than surface recall. Freely available online. One of the most thoughtful pieces written about SRS.

"How to Use Anki Effectively" — r/medicalschoolanki wiki Community-developed wisdom from thousands of medical students who have collectively logged millions of Anki reviews. Even for non-medical students, the card design and habit-building sections are applicable.

How to Remember Anything Forever-ish by Nicky Case An interactive web essay that explains spaced repetition through playable simulations. Exceptionally well-designed for visual learners and for anyone who wants to understand the algorithm intuitively. Available free at ncase.me/remember. Very short; very good.

On Optimal Spacing Intervals

Cepeda, N. J., Vul, E., Rohrer, D., Wixted, J. T., & Pashler, H. (2008). "Spacing effects in learning: A temporal ridgeline of optimal retention." Psychological Science, 19(11), 1095–1102. One of the clearest empirical studies of what optimal review intervals actually look like for different retention goals. Shows that optimal gap depends on how long you need to remember the material.

Kornell, N. (2009). "Optimising learning using flashcards: Spacing is more effective than cramming." Applied Cognitive Psychology, 23(9), 1297–1317. A study specifically on flashcard use and spacing, with clear practical implications.

On Spaced Repetition in Education

Kornell, N., & Bjork, R. A. (2008). "Optimising self-regulated study: The benefits — and costs — of dropping flashcards." Memory, 16(2), 125–136. Investigates how students naturally manage their flashcard review (badly) and how spaced repetition algorithms outperform human judgment.

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. The comprehensive review of ten learning strategies. Rates "distributed practice" (spaced repetition) as high utility — one of only two strategies to receive the highest rating.

On the FSRS Algorithm

Ye, J. (2022). "A Stochastic Shortest Path Algorithm for Optimizing Spaced Repetition Scheduling." Proceedings of the 28th ACM SIGKDD Conference on Knowledge Discovery and Data Mining. The technical paper behind FSRS. Accessible mostly to those with a data science background, but the introduction explains the motivation clearly.

"The FSRS Scheduler" — Anki documentation (apps.ankiweb.net) A practical explanation of how FSRS works in Anki and when to use it over SM-2. Updated periodically.

Skeptical Perspectives

Kornell, N. (2011). "Generation: The illusion of knowing." In A. S. Benjamin (Ed.), Successful Remembering and Successful Forgetting: A Festschrift in Honor of Robert A. Bjork. A nuanced look at the limits of spaced repetition and retrieval practice — important for calibrating enthusiasm with realism.

Pan, S. C. (2015). "The interleaving effect: Mixing it up boosts learning." Scientific American Mind. A readable summary that situates spaced repetition within the broader family of desirable difficulties, and is appropriately cautious about overgeneralizing the research.