Optimizing distributed practice: theoretical analysis and practical implications.

@article{Cepeda2009OptimizingDP,
  title={Optimizing distributed practice: theoretical analysis and practical implications.},
  author={Nicholas Cepeda and Noriko Coburn and Doug Rohrer and John T. Wixted and Michael C. Mozer and Harold Pashler},
  journal={Experimental psychology},
  year={2009},
  volume={56 4},
  pages={
          236-46
        }
}
More than a century of research shows that increasing the gap between study episodes using the same material can enhance retention, yet little is known about how this so-called distributed practice effect unfolds over nontrivial periods. In two three-session laboratory studies, we examined the effects of gap on retention of foreign vocabulary, facts, and names of visual objects, with test delays up to 6 months. An optimal gap improved final recall by up to 150%. Both studies demonstrated… 
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