You read something early in the week. An article about a subject you cared enough to open, and you got all the way to the end of it.
On Thursday somebody asks what it said.
You have the shape of it. It was about the thing, there was a part in the middle that struck you, and you agreed with most of it. That’s everything you’ve got.
Nothing is wrong with your memory. Something is wrong with the method, and the method is the one nearly everybody uses.
When you want to keep hold of something, you do one of two things. You go back over it, or you reach for a highlighter.
Those two sit at the bottom of the research. Not slightly below the alternatives. At the bottom.
Highlighting does almost nothing
A team of psychologists went through the ten things students do when they study (the highlighter, the reread, the summary, the flashcards, the spread-out schedule) and sorted them by how well each one holds up when it’s tested.
Two came out on top: spacing the work across days instead of doing it in one sitting, and quizzing yourself. Five came out at the bottom, and that group included summarizing, highlighting and underlining, and rereading.
Which is, more or less, the entire toolkit most people own.
It isn’t that a highlighter does nothing whatsoever. It’s that it does very little for the time it takes, and it takes a lot of time.
A page three-quarters yellow is what you get when everything looks important on the first pass, and on the first pass everything looks important.
Rereading feels good, and that’s the problem
Two psychologists at Washington University handed students a short passage to learn. One was about the sun and the other about sea otters, both around two hundred and fifty words, both lifted from a test-prep book.
Then they split them into three groups.
The first group studied the passage across four sittings. The second studied it across three, then sat with a blank sheet and wrote down everything they could remember. The third studied it in one sitting, then did the blank sheet three times.
Each sitting ran five minutes, long enough to read a short passage several times over. By the end, the reading group had been through it about fourteen times. The recall group had been through it about three and a half times.
Five minutes later, everybody was tested. The readers won, and not narrowly: 83% of the passage against 71%.
A week later, the same test, and the order had reversed. The readers produced 40%. The group that had barely read the thing produced 61%.
The readers had lost more than half of what they’d once had. The recall group had lost about a seventh.
Before anyone left the room that first day, all three groups were asked how well they expected to remember the passage in a week.
The four-times readers were the most confident of the three. They finished last.
That’s the trap, and it’s why the advice never takes. Rereading produces a real sensation. The words go down smoothly, nothing snags, and smooth feels like known.
It isn’t known. It’s familiarity, which is what you get from looking at something twice, and it’s gone the second the page isn’t in front of you.
Meanwhile, the method that works produces the opposite sensation. Sitting with a blank sheet is unpleasant. You get things wrong, you leave things out, and you finish with the distinct feeling that you’ve just proved you don’t know it.
That struggle is a desirable difficulty, which means the effort is doing the work rather than signaling that the work has failed. Those students got no feedback at all. Nobody told them what they’d missed. It still beat reading the passage fourteen times.
More Bolde Stories
Shutting the book is where it starts
The instruction is smaller than it sounds. Finish a chapter, or an article, or one section of something. Close it. Look away from it. Then say out loud, or write down, what was in it.
That’s the whole technique. A minute, maybe two.
Underneath, reading and remembering are two different jobs. Reading puts something in. Remembering goes and gets it. That second job is the one that does the work. Each time you make yourself find something, it gets easier to find the next time.
With the text in front of you, that never happens. You see a sentence, something in you says yes, I know that, and you move on.
You already know the difference. A face across a room is familiar right away, and the name is nowhere. Knowing you’ve seen a face before is free. Coming up with the name is work, and that work is the part that stays.
Try it on this piece. Without scrolling back up, what were the three things those students were told to do with the passage?
One comes straight away. One takes a few seconds. One won’t come at all, or comes out wrong.
The one that wouldn’t come is the part you didn’t have. It feels like you just lost it. You never had it to begin with.
This isn’t only for studying
The obvious objection is that this is school advice, and you left school.
But nothing here needs a test at the end of it. The podcast you listened to on the walk. The meeting you just walked out of. The recipe you read twice and will look up again anyway when you go to cook it.
The name of the person you were introduced to last week, which you can keep by putting the phone down for ten seconds and coming up with it yourself instead of opening the message that has it in there.
It also does more than hold things still. In one study, students read about how bats use sound to find their way around. Some reread the passage, some quizzed themselves on it.
A week later, everyone was asked about submarines, which nobody had read a word about.
The ones who had quizzed themselves did better on the submarines.
So it isn’t only that you keep more of what you read. You get better at using it somewhere you weren’t expecting to need it.
Nobody is going to examine you on any of it. The move is identical either way: close it, look away, say what it was.
Nobody tested this on novels
Look at what those students were reading.
Two hundred and fifty words about sea otters, out of a book for people cramming for an English exam, which they had been told to hold on to.
That’s a particular kind of material and a particular kind of goal, and most of this research runs on things like it: textbook passages, vocabulary lists, science definitions.
A novel is not that. You aren’t reading it in order to retain it.
You’re reading it for the hours you spend inside it, and stopping at the end of chapter four to recite the plot would take that away and hand you back something worse.
Same goes for anything you’re reading for the pleasure of the sentences.
The review that put highlighting near the bottom says as much about its own findings. None of this is a cure-all, and it works only for people who are motivated to use it and able to.
Which is a low bar and a real one. Somebody who won’t stop to try is better off with a highlighter than with nothing.
More Bolde Stories
A minute is enough to start
Pick one thing this week. An article, a chapter, an episode of something you want to keep.
At the end of it, close the thing and give yourself sixty seconds to say what was in there. Out loud in the car counts. A note on your phone counts.
Then go back and check. The students in that study got no feedback and it worked anyway, but checking is where you catch the piece you were sure about and had wrong.
You’ll be bad at it the first few times. That isn’t a reason to stop. One minute either way, and this is the minute that’s still there on Thursday.
