Chapter 9 Further Reading: Interleaving

Foundational Research Papers

Rohrer, D., & Taylor, K. (2007). "The shuffling of mathematics problems improves learning." Instructional Science, 35(6), 481–498. The foundational study on math interleaving. Documents the 2.4x advantage of interleaved over blocked practice on a one-week delayed test. Accessible and clearly written.

Taylor, K., & Rohrer, D. (2010). "The effects of interleaved practice." Applied Cognitive Psychology, 24(6), 837–848. Extended the interleaving research to elementary school math, demonstrating the effect is not limited to college students. Also explores the role of problem-type identification.

Kornell, N., & Bjork, R. A. (2008). "Learning concepts and categories: Is spacing the 'enemy of induction'?" Psychological Science, 19(6), 585–592. The artist recognition study. Extended interleaving to perceptual learning — recognizing artistic styles — showing the effect is not limited to mathematical problem-solving.

Battig, W. F. (1979). "The flexibility of human memory." In L. S. Cermak & F. I. M. Craik (Eds.), Levels of Processing in Human Memory (pp. 23–44). The paper that first clearly articulated contextual interference in motor learning. Older, but foundational for understanding where the concept originates.

Shea, J. B., & Morgan, R. L. (1979). "Contextual interference effects on the acquisition, retention, and transfer of a motor skill." Journal of Experimental Psychology: Human Learning and Memory, 5(2), 179–187. The landmark motor learning study. Documented that varied/interleaved practice produced lower performance during acquisition but significantly better retention and transfer.

Reviews and Meta-Analyses

Pan, S. C. (2015). "The interleaving effect: Mixing it up boosts learning." Scientific American Mind. A well-written popular science overview. Good entry point before diving into primary research.

Rohrer, D. (2012). "Interleaving helps students distinguish among similar concepts." Educational Psychology Review, 24(3), 355–367. A review specifically addressing when and why interleaving helps, including discussion of the discrimination mechanism.

Brady, T. F., & Kruschke, J. K. (2013). "Review of the effects of blocked and interleaved training on concept learning." Memory & Cognition, 41(1), 1–14. A more technical review of the concept learning literature, examining boundary conditions.

Books

Make It Stick: The Science of Successful Learning by Peter C. Brown, Henry L. Roediger III, and Mark A. McDaniel. Contains an excellent accessible chapter on interleaving and variable practice. Strong narrative framing.

The Art of Changing the Brain by James E. Zull. Explores the neuroscience of learning in a way that illuminates why effortful, varied practice produces more durable neural encoding.

Motor Learning and Performance by Richard Schmidt and Timothy Lee. A comprehensive textbook on motor learning that covers variable practice and contextual interference extensively. Excellent for coaches and sports educators.

On Variable Practice in Sport

Schmidt, R. A., & Bjork, R. A. (1992). "New conceptualizations of practice: Common principles in three paradigms suggest new concepts for training." Psychological Science, 3(4), 207–217. Connects motor learning research on contextual interference to cognitive learning, suggesting a unified framework. Influential for coaches and trainers.

Wulf, G. (2007). Attention and Motor Skill Learning. Human Kinetics. Explores attentional focus in motor learning, with implications for how variable practice is structured.

On the Metacognitive Challenge

Kornell, N., & Bjork, R. A. (2007). "The promise and perils of self-regulated study." Psychonomic Bulletin & Review, 14(2), 219–224. Why students choose less effective strategies (including blocking over interleaving) and what metacognitive errors drive these choices.

Bjork, R. A. (1994). "Memory and metamemory considerations in the training of human beings." In J. Metcalfe & A. Shimamura (Eds.), Metacognition: Knowing About Knowing (pp. 185–205). An important paper on the distinction between "storage" (long-term learning) and "access" (current retrieval strength), directly relevant to why interleaving produces worse immediate performance but better long-term learning.

Educational Implementation

Rohrer, D., Dedrick, R. F., & Stershic, S. (2015). "Interleaved practice improves mathematics learning." Journal of Educational Psychology, 107(3), 900–908. A rigorous classroom study — not just a lab finding — demonstrating that interleaved math assignments improve long-term learning in real school settings.

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. Rates interleaved practice as a moderate-utility strategy — below the top tier (retrieval practice, spaced practice) but meaningfully better than low-utility strategies.