Why re-reading doesn't work (and what your brain wants you to do instead)
By Christie ·
Re-reading is the default study method for almost everyone. You open the textbook, run your eyes over the highlighted bits, close it, and feel like you have done something. But if you are anything like me, when you go to tell someone what you've just learnt, you struggle.
> ...Retrieval is the thing that builds real memory.
The research on this is old and clear. Re-reading feels productive because it builds familiarity. Your brain sees the same words again and thinks "yes, I know this." That is trickery at its finest, and it's called "the fluency trap".
Introducing the fluency trap
I've read a single page at least 5 times before just trying to absorb the content. When we do this, each re-read becomes easier because you start to recognise the sentences. This makes you feel like, oh yeh — I'm getting this. Look at me go. Even your brain is led to believe you are understanding the content. Let me tell you that it's a rude shock during an exam when you absolutely don't remember it 😆.
What's really happening? You are recognising it. Like when you recognise someone you know but you don't really remember them (thinking please don't say hello to me because I can't remember your name or the context in which I know you from, help!).
Recognition is what lets you go "oh yeah, I have seen this before" when you open your notes the night before the exam. It is not what lets you write a coherent answer when the question is in front of you and the notes are not.
Retrieval is the thing that builds real memory. Retrieval is the act of pulling information out of your brain without looking at it. Every time you retrieve something, you strengthen the pathway that led you to it. Unfortunately, re-reading doesn't get you there.
If you want to procrastinate from study (not recommended). Dunlosky and colleagues reviewed decades of research on study techniques, finding re-reading right at the bottom. What was sitting at the top? Retrieval practice, of course.
What is retrieval practice?
It's the method of reading content and then retrieving everything you learnt from one read without looking. Then you check it. Whatever you missed, you try again later. If you got it right, you space out the review.
It feels harder because it is harder. It's the struggle that makes you remember. Think of any life event or trip that had something go wrong....you haven't forgotten it, have you?
A few practical shapes this takes:
Blank page recall. After a lecture or a study session, close your notes. Write down everything you remember on a blank page. Then compare. The gaps are the things to study next.
Flashcards. Not for looking at, for testing. Cover the answer, try to say it, then check.
Practice questions. Any question, any format. Old exam papers, textbook questions, questions you make up yourself. The act of trying to answer is the point, even if you cannot finish.
Explaining out loud. Talk through a concept as if teaching it to someone. This is retrieval too, because you are pulling the structure out of your brain in real time.
> The two main things to remember are: close your notes, and retrieve from memory.
Do I need to space out my retrieval?
Retrieval works better when you space it out. Like most things. You don't do legs at the gym every day. You space it out. So cramming everything into one long session of reading, retrieving, checking, repeat? Disaster. You will get more benefit spacing the same total time across days.
But why, you ask? Because if we don't give our poor brains a break, there are no gaps to consolidate memories. When you space it out, your brain loads up the consolidation trollies and starts moving your new knowledge from short-term to long-term storage. That is when you sit back, relax and let the brain do some heavy lifting. If you are forever cramming, those trollies, well, it's best we don't speak of that.
Practically speaking
Got 4 hours of study? Split it like this:
- 1 hour per day across 4 days.
- Each hour: read, close notes (blank page), retrieve, check gaps.
- Rest between sessions. Your brain consolidates during the breaks.
- Same time each day builds routine.
> But why can't I stop re-reading? > Because it feels good, productive, relaxing, and you love your highlighters (I love them too).
It gets easier
The first time you try blank page retrieval practice, you won't remember much. That's normal. The more you practice, the better you get. Your brain thrives on repetition of the right habits.
The gaps you find? Those are your study priorities.
Now is when I tell you why you are really here…
If you made it this far, stop reading and write down everything you remember. Then come back, because I built Good Study Co on retrieval practice and spacing, because they work. And they have the strongest evidence behind them.
I also built a bunch of other study tools because, despite the habitual desires of the brain, I like options. I know you do too. So if you want to see what all my fuss is about: abuse your free trial, upload your lecture notes, images of readings, transcripts of lectures, and anything you want to guide your topic learning. Then watch the magic happen as Good Study Co builds a day-by-day pathway that takes you through your content with retrieval practice built into it.
> Here is a real world example of my current course content.
If you want to build one from your own notes, create a free account and be on your way!
Or...
You can explore your own course content for free, no credit card needed. Just and email and content.
P.S. If you are wondering who "I" is — here is my story.
Sources
- Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58.
- Carpenter, S. K., Pan, S. C., & Butler, A. C. (2022). The science of effective learning with spacing and retrieval practice. Nature Reviews Psychology, 1, 496–511.
- McDermott, K. B. (2020). Practicing retrieval facilitates learning. Annual Review of Psychology.
- Latimier, A., Peyre, H., & Ramus, F. (2020). A meta-analytic review of the benefit of spacing out retrieval practice episodes on retention. Educational Psychology Review, 33, 959–987.
- Trumble, E., Lodge, J., Mandrusiak, A., & Forbes, R. (2023). Systematic review of distributed practice and retrieval practice in health professions education. Advances in Health Sciences Education, 29, 689–714.