🧒 In one sentence
Rereading and highlighting make a lesson feel familiar, but a child only really knows it when they can explain it with the book closed.
Read it three times, still forgot it
It's Thursday evening. Your child has a science test tomorrow, so they sit with the textbook and read the chapter. Then they read it again. They highlight the important parts in yellow, and read the yellow parts one more time. "I know it," they say, and they mean it.
The next day, the test comes back with a disappointing grade. "But I studied!" And they did. They spent real time and real effort. The problem wasn't laziness. The problem was that the studying felt like learning, without getting into the brain in a way that would make it stick.
Psychologists call this the illusion of learning (you may also see it called the illusion of competence or the fluency illusion). It catches children, teenagers, university students and adults alike. The good news: once you know what it looks like, it's easy to spot, and easy to fix.
What the illusion of learning is
There are two different ways of knowing something:
- Recognising it: when you see the information, it looks familiar. "Oh yes, photosynthesis, I've seen this."
- Recalling it: you can bring the information back on your own, with the book closed. "Photosynthesis is how plants use sunlight to make food from water and carbon dioxide."
Rereading builds recognition. Each time a child reads the same page, it flows more easily and feels more familiar. The brain quietly takes that ease as a sign of knowing. But a test, a class discussion or real life doesn't let you look at the page. All of them ask you to recall.
That gap between "it looks familiar" and "I can explain it" is the illusion of learning.
Four study habits that feel productive but aren't
In 2013, a team of psychologists led by John Dunlosky reviewed the research on ten common study techniques. Rereading and highlighting both landed in the lowest group, while practice testing and spreading study over time came out on top (Dunlosky et al., 2013). Here are the four habits most children fall into.
1. Rereading
This is by far the most popular study method. When researchers asked 177 university students how they studied, 84% said they reread their notes or textbook, and 55% named it as their main strategy. Only 1% named testing themselves as their main strategy (Karpicke, Butler and Roediger, 2009). If that's what university students do, it's no surprise that children do the same.
Reading once is useful: it's how new information gets in. Reading the same page again straight away doesn't add much value.
2. Highlighting and underlining
A page full of colour looks like hard work, and that's why it's so tempting. Choosing what to highlight can help a little, but highlighting on its own rarely helps children remember. It can also make a whole page look "done" when very little has been understood.
3. Copying notes neatly
Rewriting notes word for word, or making them beautiful, keeps hands busy while the brain rests. The words travel from the page to the pen without being pulled from memory.
4. Cramming the night before
Cramming works, for about a day. In a well-known experiment (Roediger and Karpicke, 2006), students who restudied a text did better on a test five minutes later than students who practised recalling it.
Other students in the same experiment took the test a week later. Which group remembered more?
Make your prediction, then tap an answer to check!
Why these habits feel so good
If rereading and highlighting work so poorly, why does almost everyone use them? Because they feel good in three ways:
- They're easy. The material flows, nothing feels confusing, and easy feels like progress.
- They leave proof of effort. Colourful pages and neat notes are something a child can show a parent, and something a parent can see.
- They give quick results. As the cramming experiment shows, restudying really does help on a test a few minutes later. That short-term boost hides the long-term loss.
The strategies that work best often feel the opposite: a little harder, a little slower, and sometimes a bit uncomfortable. Researchers call these (Ways of studying that feel harder in the moment, like recalling or mixing problems, but make learning last longer.). When a child has to stop and think "wait, what was the second step?", that moment of effort is the point where memory gets stronger.
So a struggling moment during study isn't a sign that something has gone wrong. Often it's a sign that learning is happening.
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See what you’ll get →The 2-minute check: does your child really know it?
You don't need a test to see past the illusion. You need two minutes and a closed book.
The 2-minute check: the book is closed, the question is open, and the grown-up just listens.
- Close the book. Notes away, screen off.
- Ask one open question. "Tell me what you learned about the water cycle." Avoid yes/no questions such as "Do you get it?"; almost everyone says yes.
- Listen without helping. Let them talk, pause and search. Resist finishing their sentences. Remember, a little bit of struggle is helpful to make those connections really stick.
- Open the book together and compare. What did they get right? What was missing or where were they confused?
- Go back only to the gaps. Reread the missing parts, then close the book and try again.
If your child says "I know it, I just can't explain it," that's the illusion speaking. Being able to explain is the knowing.
What to do instead
You don't have to throw out reading. Read once to understand, then switch to methods that make the brain work to bring information back:
- Self-testing ( (Learning by pulling information out of your memory, for example by answering questions with the book closed.)): flashcards, practice questions, the questions at the end of the chapter, or a (Writing down everything you remember about a topic on a blank page, without looking at the book or notes.) on a blank page.
- Spacing: several short sessions over a few days instead of one long session the night before.
- Teaching someone else: explaining the lesson to a parent, a sibling, a stuffed toy, or the family dog. The act of explaining to a listener forces you to clarify your own understanding.
- Mixing it up: practising different types of problems together, rather than twenty of the same kind.
Try it: reread vs self-test
For the next test, study half the material by rereading and half by self-testing, then see which half went better. Seeing the difference for themselves often convinces a child more than anything a parent says.
How it looks at different ages
Elementary school (about 6 to 10). Younger children need recall to be guided and playful. A blank page can feel daunting at this age; in a study with 4th graders, structured recall activities worked better than "write everything you remember" (Learning Scientists). Ask out loud, use pictures as prompts, and let them tell you the story of what they learned. Keep it short: five minutes is plenty.
Middle school (about 11 to 14). This is when homework multiplies and the illusion really takes hold. Teach the 2-minute check as a routine: read, close, explain, compare. Coach rather than quiz: "How will you check if you know it?" works better than standing over them.
High school. Teenagers can run the whole process on their own: practice questions, flashcards, past papers, and study planned over several days. Your role is to explain why, because self-testing feels harder and they may resist it.
University and adult learners. The research behind this article was mostly done with university students, and they fall for the illusion just as often. The same rule holds at every age: if you can't recall it with the book closed, you don't know it well enough yet.
Key takeaways
- Rereading builds recognition ("it looks familiar"), but tests and real life ask for recall ("I can explain it").
- Rereading, highlighting, neat copying and cramming feel productive because they are easy, visible and give quick results.
- A moment of struggle while studying is often a sign that learning is happening.
- The 2-minute check: close the book, ask one open question, listen, compare, and go back only to the gaps.
- Read once to understand, then switch to self-testing, spacing, teaching someone else and mixing problems.
Frequently asked questions
Is rereading ever useful?
Yes. A first careful read is how new material gets in. Rereading also helps more when there is a gap of a few days in between, because then it works a bit like a recall attempt (UBC). What doesn't help is reading the same page again and again in one sitting.
Should I stop my child from highlighting?
No need to ban it. Suggest highlighting only a few key ideas, then turning each one into a question to answer with the book closed.
My child gets frustrated when they can't remember. What should I do?
That's normal: nobody likes to feel stuck or confused. Keep self-testing low-stakes: no grades, no comparisons. Treat a mistake as a discovery ("Great, now we know what to look at"), not a failure. If frustration builds up, pause the session and get them moving - a quick walk or stretch resets the brain. Also, model learning new things yourself and be okay with not knowing everything. The more your child sees that learning is a process, the less pressure they will feel to get it right the first time.
How long should a study session be?
Short and frequent is better than long but rare. For younger children a few minutes is enough; older students can work longer, with breaks and with sessions spread over several days. Check out (A way of studying in short, focused blocks (often 25 minutes) with a 5-minute break after each one.) timers or apps for ideas on how to structure study time.
If you're supporting your child through the school year, our guide to improving your child's working memory explains why some tasks are hard to hold in mind, 12 easy tricks for multiplication tables puts recall practice to work on times tables, and Curious and Calm helps with the worries a new term can bring.
Enjoy learning!
