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1 min readJanuary 10, 2024

The Science Behind Spaced Repetition: How Algorithms Optimize Learning

Spaced repetition is not just a study technique—it's a scientifically backed method that leverages how our brains naturally form and retain memories. Understanding the algorithm behind it can help you study more effectively.

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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