The Forgetting Curve
Discovered by Hermann Ebbinghaus in 1885, the forgetting curve shows that we forget information exponentially over time. Without review, we lose about 50% of new information within an hour and 90% within a week.
How Spaced Repetition Works
The algorithm calculates optimal review intervals based on your performance. Easy cards are shown less frequently, while difficult ones appear more often. This maximizes learning efficiency by focusing time on challenging material.
Implementation in Digital Flashcards
Modern spaced repetition systems use sophisticated algorithms that consider factors like ease of recall, number of repetitions, and time since last review to determine when you should see each card again.
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