You forget fastest right after you learn.

What did the forgetting curve actually measure?

Ebbinghaus learned lists of 13 meaningless syllables, then measured how much less effort it took to relearn the same list after a delay. That saved share is called “savings.” The only participant was Ebbinghaus.

The results are in the table above. After one hour, about half of the original effort was needed again; after a day, about a third was still saved, and after a month, about a fifth. Ebbinghaus summed it up: forgetting is “very rapid at the beginning of the process and very slow at the end.”

Do we really forget 70% within a day?

Not in any simple sense. Savings is not the share you remember; it is the share of relearning effort you save. Claims like “you forget X% in 24 hours” oversimplify the original experiment.

The material was meaningless syllables and there was a single participant, so the numbers do not transfer directly to a lecture or a meeting. The part that holds up is the shape: fast forgetting at first, slower later.

Has the forgetting curve been replicated?

Yes. In 2015, Murre and Dros repeated the experiment with the same method. One participant spent about 70 hours learning lists and relearning them after 20 minutes, 1 hour, 9 hours, 1, 2, 6 and 31 days, and the results were similar to Ebbinghaus’s original data (PLOS ONE).

One detail stands out. Ebbinghaus suspected the one-day value (33.7%) was a bit too high by chance, but the replication also found the curve is not completely smooth, with a small upward jump at the 24-hour point. Some researchers attribute this to sleep.

How should you review so you forget less?

First, recall instead of rereading. In Roediger and Karpicke (2006), students read short prose passages, then either reread them or wrote down what they remembered without looking. On a test five minutes later, rereading did better. After two days and after a week, the recall group remembered substantially more, even though the rereading group felt more confident. The authors concluded: “Testing is a powerful means of improving learning, not just assessing it.”

Second, space your reviews. A meta-analysis by Cepeda and colleagues (2006) covering 317 experiments in 184 articles found that the best gap between study sessions grows with how long you need to remember. A follow-up with more than 1,350 people (2008) found the best gap was about 20–40% of the time until a test one week away, falling to about 5–10% for a test one year away.

A review of ten study techniques by Dunlosky and colleagues (2013) rated practice testing and distributed practice “high utility,” and rereading and highlighting “low utility.”

Does this apply to meetings too?

With care. Most of this research used word lists, short passages and facts, not meetings.

Still, “you forget fastest at first” is a useful rule at work. Write down decisions, action items, numbers and dates the same day and share them. Starting the next meeting by recalling last time’s action items is a natural spaced review.

How does a recording change your review?

A recording lets you check the exact words when your memory gets fuzzy. NoteCube records lectures and meetings on your phone and transcribes Korean and English live, with speakers and timestamps. Tap a line to replay that moment.

When you stop, a meeting is organized into a summary, decisions and action items; a class into a summary, new expressions, mixed-up expressions and sentences to review, with expressions collected in a phrasebook and word cards. Reading a summary on its own is close to rereading, so write down what you remember first, then compare. AI results can be wrong, so check important parts against the recording.