Why highlighting feels like learning
Highlighting gives you something to do while you read. The page fills with colour, the important bits stand out, and it feels like progress. Later, flicking back through highlights feels like revision.
The problem is what it asks of your brain: almost nothing. Choosing a sentence to mark is a quick judgement, not an act of understanding. And re-reading highlights makes the text feel familiar, which is easy to mistake for knowing it.
What the research says
In 2013, John Dunlosky and colleagues reviewed ten popular study techniques against the evidence. Highlighting and re-reading were rated low-utility. Only two techniques were rated high-utility: practice testing and spacing practice over time.
Self-testing works because producing an answer strengthens memory in a way that seeing it doesn't. In a 2006 study, students who tested themselves on a passage recalled 61% of it a week later, against 40% for students who re-read it (Roediger & Karpicke).
Highlighting vs self-testing
- Effort. Highlighting is easy. Self-testing is effortful, and the effort is what builds memory.
- Feedback. Highlighting never tells you what you've forgotten. Self-testing does, every time.
- A week later. Highlighted text is familiar. Self-tested concepts are recallable.
A highlight marks what you meant to remember. A question tests whether you did.
5 alternatives to highlighting while reading
1. Write a question, not a highlight
Where you would highlight, write a short question in the margin or a note: "Why does this pricing model fail for small customers?" Later, answer it without looking.
2. Summarise from memory at the end of each section
Close the book or tab and write two sentences on what the section said. Then check. This is self-testing built into your reading.
3. Predict before you read on
Before the conclusion or the next chapter, guess what the author will argue. Being wrong and then corrected is one of the strongest ways to remember the right answer.
4. Explain it out loud
Explain the concept to a colleague, or to no one, as if they had never heard it. The places you stumble are the places you don't know it yet.
5. Recall before you re-read
When you come back to something a few days later, spend a minute recalling it before you open it. It turns every re-read into a test.
If you can't give up highlighting, use it as a pointer: highlight sparingly, then turn each highlight into a question you test yourself on later.
How LearnBetter helps
LearnBetter replaces the highlight-and-forget habit with self-testing that happens on its own. Add what you are reading — an article link, a PDF or ebook, a Word document, a YouTube video or pasted text — and it picks out the key concepts and writes the questions for you.
Each concept comes back at growing gaps, first to recall and then to apply in new situations. No highlighting, no question-writing: just the part that works.
This article is part of our guide to how to learn better — six science-backed habits for remembering and using what you read.
Frequently Asked Questions
Very little. A 2013 review of study techniques rated highlighting as low-utility because it marks text without requiring you to process or retrieve it.
Self-testing: answering questions from memory. It was one of only two techniques rated high-utility in the same review, alongside spacing your practice over time.
Write questions in the margin, summarise each section from memory, predict before reading on, explain concepts out loud, and recall before re-reading.
Not entirely; it can mark what to come back to. But on its own it builds familiarity, not memory. Turn highlights into questions and test yourself on them.
Because familiar text is easy to process, and that ease feels like knowing. It's a poor guide to what you'll remember later.
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.
- Roediger, H.L. & Karpicke, J.D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
- Brown, P.C., Roediger, H.L., & McDaniel, M.A. (2014). Make It Stick: The Science of Successful Learning. Harvard University Press.
- Slamecka, N.J. & Graf, P. (1978). The generation effect: Delineation of a phenomenon. Journal of Experimental Psychology: Human Learning and Memory, 4(6), 592–604.
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