Learning Methods12 min
When to Review What You Learned: The Forgetting-Curve Timing Science
Reviewing 'when you remember' or 'right before the exam' means losing about 70% of new information within 24 hours (Ebbinghaus). Cepeda et al. (2008) defined the optimal spacing lag (10-20% rule), Kornell & Bjork (2008) proved the spacing effect, and FSRS now adapts review intervals to each learner. We compare fixed 1-3-7-30 systems with FSRS-driven adaptive scheduling in Memly.