The Science of Remembering English Words: How Spaced Repetition Boosts Long-Term Memory

Inspired by the 2024 University of Tokyo Study on Spaced Retention

Have you ever learned a new English word, only to forget it a few days later? You’re not alone! Most English learners face this challenge. Luckily, a new study from the University of Tokyo (2024) shows a powerful way to remember words for good — it’s called spaced repetition.

A person in a striped shirt reaches across a white table to adjust a small spiral-bound calendar, indicating planning or preparation for upcoming events.

In this post, we’ll explain what spaced repetition is, how it helps your brain remember English vocabulary, and how you can use it every day to learn English faster and more effectively.

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What the Study Found

Researchers at the University of Tokyo studied how learners store and retrieve new vocabulary over time. They discovered that reviewing words at gradually increasing intervals helps move information from short-term memory to long-term memory.

In the study, English learners who reviewed new words after 1 day, 3 days, 7 days, and 14 days remembered 60% more words after a month compared to those who only studied once.

This technique, known as the spaced repetition effect, trains your brain to recall information just before you forget it — strengthening the memory each time.

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Why Spaced Repetition Works

When you learn a new word, your brain stores it temporarily. Without review, that memory fades quickly — this is called the forgetting curve. Spaced repetition “resets” this curve every time you review, making the memory stronger.

The more often you review at the right times, the deeper the word is stored in your memory.

Over time, you won’t just recognize the word — you’ll be able to use it naturally in speaking and writing.

How to Use Spaced Repetition to Remember English Words

Here are some simple, science-backed tips you can start using today:

1. Review words after 1 day, 3 days, and 7 days

When you learn a new set of words, go back the next day to review them. Then review again after three days, and once more after a week. You’ll notice how much stronger your memory becomes.

2. Use flashcards or apps

Try digital flashcard apps like Anki, Quizlet, or Memrise — they automatically schedule reviews for you using the spaced repetition method.

3. Say and use new words in sentences

Writing or saying new words in real sentences helps connect them to real experiences. For example:

“I’m determined to improve my English vocabulary every day.”

4. Make review fun

Don’t just repeat words — read short English stories, listen to podcasts, or quiz yourself with friends. When your brain enjoys learning, memory improves naturally.

5. Be consistent, not perfect

You don’t need to study for hours. Just 10–20 minutes of review each day is enough to create lasting results.

Final Thoughts

The science is clear — spaced repetition works. If you use this method consistently, you’ll remember English words longer, understand them better, and feel more confident using them in conversation.

The University of Tokyo study reminds us that learning English isn’t about cramming — it’s about smart review. With the right timing and consistent effort, your vocabulary will grow faster than ever.

So next time you learn a new word, don’t just study it once — come back to it later. Your brain will thank you!