EdTech Glossary
Updated January 19, 2026

Forgetting Curve

Definition

A mathematical model discovered by Hermann Ebbinghaus showing how information is lost over time when there is no attempt to retain it, with the steepest decline occurring shortly after learning.

What is the Forgetting Curve?

The forgetting curve, discovered by German psychologist Hermann Ebbinghaus in 1885, illustrates how quickly we forget newly learned information. Without reinforcement, we lose approximately:

  • 50% within the first hour
  • 70% within 24 hours
  • 90% within a week

The Shape of Forgetting

The curve is exponential - forgetting happens rapidly at first, then slows down. This is why cramming doesn't work for long-term retention.

How to Combat the Forgetting Curve

Strategy How It Helps
Spaced repetition Reviews at optimal intervals
Active recall Strengthens memory traces
Meaningful connections Links to existing knowledge
Sleep Consolidates memories
Microlearning Reduces cognitive overload

Implications for Learning

Understanding the forgetting curve fundamentally changes how we should approach education. Instead of one-time learning events, we need systems that reinforce knowledge over time - exactly what ScrollEd's AI smart scrolling provides.

Key Takeaway: Forgetting is natural and predictable. Smart learners design their study habits around the forgetting curve, not against it.

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A mathematical model discovered by Hermann Ebbinghaus showing how information is lost over time when there is no attempt to retain it, with the steepest decline occurring shortly after learning.

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The Forgetting Curve Explained - Why We Forget & How to Remember | ScrollEd