Spaced Practice Beats Massed Study

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1. 11 July 2026 · corrected by Emir Baycan

   2 flagged findings: an unverified quote attributed to Dr. Robert Bjork containing an embedded unverified '50-200% retention advantage' statistic; a set of Ebbinghaus forgetting-curve figures (40%/60%/75%/90%) that directly contradicted the different, already-fact-checked figures (42%/56%/66%/75%/79%) used for the same concept in a sibling article this session (how-long-term-memory-works-certification-study.md).

   Before

   "The spacing effect is one of the most robust phenomena in cognitive psychology, and one of the least utilized by students. Distributing study across time -- even when total study time is held constant -- consistently produces retention advantages of 50-200% compared to massed practice, measured at delays of one week or more." -- Dr. Robert Bjork, Department of Psychology, University of California Los Angeles [...] 40% within 20 minutes / 60% within an hour / 75% within 24 hours / 90% within a week

   After

   The spacing effect is one of the most robust phenomena in cognitive psychology, and one of the least utilized by students. Distributing study across time, even when total study time is held constant, consistently produces a meaningful retention advantage over massed practice at delays of one week or more. [...] 42% within 20 minutes / 56% within an hour / 66% within 24 hours / 75% within a week

   Why: Removed an unverified quote attributed to Dr. Robert Bjork containing an embedded unverified '50-200% retention advantage' statistic, and corrected a set of Ebbinghaus forgetting-curve figures (40%/60%/75%/90%) that contradicted the different, already-fact-checked figures used for the same concept in the sibling article how-long-term-memory-works-certification-study.md. Also corrected the same unverified statistic where it had leaked into the post's excerpt and meta description fields.

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