Losing the stamina to read or sustain a long task has more than one possible explanation. What the consumption habit explains — and what it may be covering up.
He noticed it on a Sunday afternoon.
The book had been sitting there for weeks. He settled into the chair, read two pages — and by the third he had his phone in his hand, with no memory of reaching into his pocket for it.
It wasn’t the first time. It was the first time he noticed.
On Monday the same shape shows up somewhere else. The brief that used to come out in one sitting now takes the whole morning, cut into fifteen pieces. He opens the file, checks the notification, answers it, comes back — and has to reread the paragraph to find his place. He still delivers on time, the way he always has. What changed is the cost.
That night, the explanation that comes to mind is the same one as always: it’s the phone.
The explanation is partly true
And it is now somewhat better documented.
Using functional MRI, researchers compared what happens during recall of material learned two different ways: through short, fragmented videos, or through longer, continuous ones. The people who learned from the fragmented format remembered less — and, while retrieving the information, showed less coordination between brain regions involved in assembling the pieces into a coherent scene, in sustaining the deliberate effort of searching memory, and in making sense of what they had seen.
The reading the authors offer is that continuous narrative helps form a more complete memory trace, easier to reconstruct later. Fragmented content captures attention easily — it was designed to — but it captures by the cheaper route, the one driven by whatever jumps out, rather than the route that requires intention.
It’s worth saying what the study does not show, because that matters. It does not prove the habit causes permanent damage, it does not establish an exposure threshold beyond which something happens, and it does not tell us whether the effect undoes itself when the habit changes. The authors are explicit about this. What the research does is give shape to a complaint that was already arriving in the office without a name: the sense that the mind has lost its stamina for long stretches.
The trouble starts when that becomes the only explanation
Blaming the phone is comfortable for one reason: it’s the reading that asks nothing of you beyond discipline. If the problem is habit, the fix is willpower — and a professional who built a life on discipline tends to find that a fair bargain.
But “I’ve lost my concentration” is one of the least specific complaints in psychiatry. It is the endpoint of several very different paths, and some of them don’t improve with any amount of discipline.
Depression can show up in the head before it shows up in the mood. The person doesn’t feel sad, so they rule out the possibility immediately. What they feel is slowness, difficulty deciding, reading that won’t go in. I wrote about that presentation in depression is not sadness: when the body stops first.
Anxiety occupies processing space. Part of your attention stays allocated to monitoring threat — the message that hasn’t arrived, the deadline, the conversation left unresolved — and what’s left over for the task is less than it used to be.
Sleep explains more than people expect. Broken nights, undiagnosed apnea, the habit of ending the day with a screen in the dark. Attention is the first function poor sleep takes down.
Social drinking belongs in this account too, often at amounts no one would call a problem.
And there is the ADHD that was always there. It didn’t appear now: for years it was offset by intelligence, by hyperfocus on things that mattered, by external structure holding the routine together. When demand rises — a promotion, a partnership, a small child, a workload that doubled — the compensation stops covering it, and the symptom surfaces for the first time in someone’s late thirties or forties.
What concerns me about this moment
The phrase “brain rot” travels well. It’s satisfying to say, it explains things quickly, and it has the advantage of accusing no one of being ill — only of being hooked on scrolling, like everyone else.
The risk is the path that tends to follow. Someone recognizes themselves in the description, searches online, lands on ADHD, finds a symptom list that matches what they feel — and the next appointment is no longer a question. It’s a request.
Medication for ADHD exists, and it works well when the diagnosis is right. The problem is what happens when it isn’t. A stimulant started on top of untreated anxiety, on top of an unrecognized bipolar spectrum presentation, on top of wrecked sleep or a depression that showed up cognitively can worsen exactly what it was meant to fix — and in some of those scenarios, worsen it considerably. I covered this in ADHD or not? The differential diagnoses.
None of this means the hypothesis is wrong. It means it is one among several, and that the order matters: first you sort out what it is, then you decide what to do.
Perhaps none of this describes you
And there would be nothing wrong with that. Plenty of people read this far and conclude, reasonably, that their own case is simpler than it looked — that it really is just habit, and that cutting back on exposure will handle it. Usually it does.
But perhaps something sounded familiar. Or perhaps you thought of someone else — a partner, a colleague, someone at home — who has been saying the same things.
If so, the question worth asking isn’t “how much time do I spend on my phone.” It’s a different one, and a less comfortable one:
Did this start alongside the habit, or did the habit get easier because something had already changed?
Someone who started scrolling more after their sleep got worse, after work became unbearable, after they stopped wanting things that used to bring pleasure — that person isn’t facing a discipline problem. The screen became the place where it’s still possible to stay, rather than the reason they can’t stay anywhere else.
Telling those two apart isn’t something you do alone, rereading symptom lists. It’s done by looking at the whole history unhurriedly, with someone who has seen this complaint arrive by both routes.
Related reading
- The lawyer under continuous pressure: when the body collects the debt before the mind sounds the alarm
- Holding it together at work while your life falls apart
- Going back to work after a severe depression
Has your concentration changed lately, and you can’t tell whether it’s habit or something else?
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Dr. Leonardo Sodré is a psychiatrist and psychotherapist in Brasília, Brazil (CRM-DF 14.206 · RQE 14.761). He holds a PhD in Psychiatry from UFRGS and teaches at the University of Brasília School of Medicine. This content is informative and educational and does not replace individual assessment, diagnosis or treatment.