Spaced retrieval: absolute spacing enhances learning regardless of relative spacing.

@article{Karpicke2011SpacedRA,
  title={Spaced retrieval: absolute spacing enhances learning regardless of relative spacing.},
  author={Jeffrey D. Karpicke and Althea Bauernschmidt},
  journal={Journal of experimental psychology. Learning, memory, and cognition},
  year={2011},
  volume={37 5},
  pages={
          1250-7
        }
}
Repeated retrieval enhances long-term retention, and spaced repetition also enhances retention. A question with practical and theoretical significance is whether there are particular schedules of spaced retrieval (e.g., gradually expanding the interval between tests) that produce the best learning. In the present experiment, subjects studied and were tested on items until they could recall each one. They then practiced recalling the items on 3 repeated tests that were distributed according to… 

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