Beat The Forgetting Curve in Your Mandarin Studies
You learn 尴尬 (gāngà, awkward) on Monday, and by Thursday you stare at it and get nothing. Every Mandarin learner knows that feeling. It isn't a sign that you're "bad at languages"; it's the normal way memory works, and it has a name: the forgetting curve. Once you understand it, you can plan your reviews so that new words stay put.
Understanding The Forgetting Curve
The forgetting curve comes from the German psychologist Hermann Ebbinghaus, who published his memory experiments in 1885 in Über das Gedächtnis (On Memory). He was his own and only test subject. He learned lists of nonsense syllables until he could recite them perfectly, waited anywhere from 20 minutes to 31 days, then measured how long it took to learn each list again. The result was a curve that falls steeply at first and then levels off: most of the forgetting happens soon after learning, and what survives fades much more slowly.
You can see the same pattern with Chinese. A word you meet every day, like 你好 (nǐ hǎo, hello), never has a chance to fade. A word you met once in a textbook, like 打折 (dǎzhé, to give a discount), slips away within days unless something brings it back. Your brain has no way of knowing that 打折 matters to you until you keep meeting it.
What Ebbinghaus Found
Ebbinghaus's results show the steepest drop in the first hour, and most of the loss within the first day. After that the curve flattens: the difference between one week and one month was small compared with the difference between twenty minutes and a day.
The practical lesson is that an early first review does a lot of work. Seeing a new word again later the same day, or the next day, catches it before most of it has gone.
Ebbinghaus's Numbers, and What They Don't Mean
These are the figures Ebbinghaus reported. They're often quoted as "how much you remember", but that isn't what he measured.
| Time since learning | Savings when relearning |
|---|---|
| 20 minutes | 58% |
| 1 hour | 44% |
| About 9 hours | 36% |
| 1 day | 34% |
| 2 days | 28% |
| 6 days | 25% |
| 31 days | 21% |
"Savings" means how much less time it took to relearn a list than to learn it the first time. A 44% saving after an hour means relearning took 44% less time, not that he could still recall 44% of the syllables. In 2015, Jaap Murre and Joeri Dros repeated the experiment and found a very similar curve.
A few things the curve doesn't tell you:
- It isn't a law for every word. Ebbinghaus tested one person on meaningless syllables. Real words, met in sentences you understand, tend to stick better, and how fast you forget depends on how well you learned something in the first place.
- It shows forgetting without review. The famous curve is what happens when you do nothing. Ebbinghaus did look at review timing too: in one experiment, 38 repetitions spread over three days left a list as easy to relearn as 68 repetitions crammed into one day.
Forgetting is the default. The useful question isn't how to stop it, but when to review so that each review counts.
Why Cramming Fails Long-Term
Cramming can get you through a vocabulary quiz tomorrow, but it does little for next month. Psychologists call this the spacing effect: the same amount of study, spread out over time, leads to much better long-term memory than one big session. A 2006 review by Cepeda and colleagues, covering hundreds of experiments, found spaced study beat massed study consistently. The catch is that cramming feels more effective, because everything seems fresh while you're doing it.
How Your Brain Actually Learns and Remembers
Knowing why you forget is half the story. The other half is how memories get stronger, and two well-tested ideas from cognitive science do most of the work: spaced repetition and active recall.
Think of learning a new word, say 学习 (xuéxí, to study), as making a path through a forest. The first time, you leave a faint trail. Leave it alone and it soon grows over. Walk it again before it disappears, and it gets a little clearer; walk it a few more times and it becomes easy to follow.
Forging Memories with Spaced Repetition
Spaced repetition doesn't mean repeating a word twenty times in one sitting. It means reviewing it at gradually longer intervals: perhaps a day after you first meet 学习, then a few days later, then a week later, then a few weeks after that. Each successful review makes the memory last longer, so the next gap can be longer too.
The efficiency comes from timing. You spend your review time on words that are starting to fade, not on words you already know well. Our article on what spaced repetition is covers the history, from Leitner boxes to the algorithms in today's apps.
The Power of Active Recall
Spaced repetition tells you when to review; active recall tells you how. Active recall means pulling the answer out of your memory before you see it, rather than re-reading it.
- Passive review: you see 学 next to its meaning, "to study", and think "yes, I know that". It feels productive, but it builds little.
- Active recall: you see 学 on its own and have to come up with the meaning and the pronunciation (xué) before you check.
That effort is what strengthens the memory. In a well-known study, Roediger and Karpicke (2006) found that students who tested themselves on a passage remembered much more a week later than students who re-read it, even though the re-readers felt more confident. A 2013 review of study techniques by Dunlosky and colleagues rated practice testing and spaced practice as the two most useful techniques they examined.
Put the two together, testing yourself at well-timed intervals, and you have the strongest defence against the forgetting curve that we know of.
Using Spaced Repetition to Master Mandarin
Tracking by hand when to review every word, character and grammar point you're learning isn't realistic. That's what a spaced repetition system (SRS) is for: software that keeps track of every item and decides what you should review each day.
How an SRS Automates Your Learning
In a flashcard SRS like Anki, you rate each card after you answer it. Mark a card as easy and its next review is pushed days or weeks into the future; get it wrong and it comes back soon, often the same day. Over time, well-known cards appear rarely and difficult ones appear often, which is exactly the effort you'd want.
Mandarin Mosaic does the same job differently. It tracks words rather than cards: each time you see a word in a sentence, the app lengthens the gap before it shows that word again. When words are due, the Words to review lesson brings them back in fresh sentences, with the due word blanked out as a fill-in-the-blank (cloze) question, so you recall it rather than just reread it. You don't rate cards yourself, which is simpler but gives you less fine control than Anki. Our spaced repetition guide explains the settings.
The Power of Smart Prioritisation
For a language with as much vocabulary to learn as Mandarin, this prioritisation matters. Instead of a mountain of words, you get a daily review pile sized to what you're actually forgetting. Each successful review pushes that word's next forgetting point further away, so the pile stays manageable as your vocabulary grows.
The one rule that makes it work is doing your reviews regularly. An SRS can only time reviews well if you turn up for them.
Learning Mandarin Vocabulary in Context
Spaced repetition decides when you review. What you review matters just as much. A word learned from a list is tied to nothing; a word learned in a sentence comes with its meaning, its grammar and its neighbours, which gives your memory more to hold on to.
This is the idea behind sentence mining: instead of learning 知道 (zhīdào, to know) on its own, you learn it inside a complete, natural sentence and review that.
Why Context Helps
Compare these two:
- Isolated word: 知道 (zhīdào), to know.
- Word in context: 我不知道他在说什么 (wǒ bù zhīdào tā zài shuō shénme), I don't know what he's saying.
From the sentence you also learn the negative form 不知道 (bù zhīdào), where the word sits, and the useful pattern 在说什么 (zài shuō shénme, is saying what). Each of those links is another way back to the word when you need it.
Streamlining Your Study with Smart Tools
Sentence mining by hand is slow: you have to find sentences at the right level, look up the words, make the cards and schedule them. Mandarin Mosaic is built to do that part for you. It keeps track of the words you know and picks sentences with one new word where possible, the "i+1" idea. Because you understand the rest of the sentence, the context helps explain the new word.
You can tap any word for its meaning and hear it read aloud, and every built-in sentence has been checked by a native speaker. The new word is blanked out as a cloze question, so even your first meeting with it involves a little active recall. Our article on cloze tests for learning Chinese explains why that format works, and the guide to sentence mining in Mandarin Mosaic walks through the app step by step.
Building a Sustainable Mandarin Study Routine
Knowing how memory works only helps if you act on it every day. With spaced repetition, consistency beats intensity: twenty minutes daily does far more than three hours on a Sunday, because the reviews land when they're due.
Finding Time in a Busy Schedule
Short sessions fit into the gaps in your day: the commute, a lunch break, the queue for a coffee. With an app that schedules reviews for you, 15 to 20 minutes is enough for a useful session. (At the time of writing, Mandarin Mosaic has a 30-day free trial, after which the free plan gives you 1 lesson a day and Premium removes the limit.)
For more ways to fit Chinese into your day, see our guide to daily habits to boost your Chinese.
Sample Daily Study Schedules for Mandarin Learners
Your routine will depend on your life and goals. These two examples show how reviews and new material can fit together.
| Learner Profile | Daily Time Commitment | Core Activities |
|---|---|---|
| The Busy Professional | 20 Minutes | Morning Commute (10 mins): Do your SRS reviews for the day. Lunch Break (10 mins): Learn 5-10 new words from sentences, paying attention to how each one is used. |
| The Dedicated Student | 60 Minutes | Morning Session (20 mins): Clear your SRS reviews. Afternoon Session (25 mins): Learn 15-20 new words from sentences, or mine them from something you're reading. Evening Review (15 mins): Go back over the new sentences from earlier, to give them that important first review on the same day. |
Treat these as templates, not rules. The one principle worth keeping is reviews first, then new material: due reviews are the ones about to slip, so they come before anything new.
Creating a Balanced Learning Loop
A good routine is a loop. New sentences feed fresh words into your system; daily reviews keep the old ones alive. If you only add new words, your review pile grows until it swamps you. If you only review, you stop making progress. Keep both going in small, steady amounts and your vocabulary grows without the pile getting out of hand.
Frequently Asked Questions About The Forgetting Curve
How Many New Mandarin Words Should I Learn Daily?
It's personal, but 10 to 20 new words a day is a sensible starting point for most learners. Remember that every new word adds reviews for weeks to come, so if your reviews start taking too long, cut back on new words for a while. If you have room, add a few more. Our article on how many characters to learn per day looks at daily targets in more detail.
The goal is a habit you can keep up for months or years. Taking on too much too soon and burning out is a common mistake.
What If I Miss a Day of Reviews?
Don't worry about it. In a spaced repetition system, reviews you miss simply wait for your next session. You'll have a bigger pile for a day or two, and a few words may need relearning, but the system copes. Just get back into your routine as soon as you can.
Should I Only Use an SRS to Study?
No. An SRS is excellent for keeping vocabulary in your head, but fluency needs more than that:
- Listening: podcasts, music and TV shows in Mandarin.
- Speaking: practice with a language partner or a tutor.
- Reading: graded readers or articles you find genuinely interesting.
- Writing: writing characters and putting your own sentences together.
These activities show you the words you're reviewing being used in real situations, and every time you meet a word out in the wild, that's another free review.
Want a study tool that works with the forgetting curve rather than against it? Mandarin Mosaic combines sentence mining, cloze practice and spaced repetition in one app for iOS and Android. Find out more and try it free.