It is quarter past nine. Tom has his laptop open, coffee next to it, calendar empty until eleven. The task is clear: write up yesterday's meeting notes. He opens the document. Reads the first line. Thinks of an email he still has to send. Looks at the clock. It is half past nine. He has not typed anything. At ten he gets up to fetch water, and on the way back he feels that familiar heaviness in his stomach. Again.
Everyone knows procrastination. What Tom experiences is something else, and more stubborn. From the outside it looks like doing nothing. On the inside it is a fight that costs every minute and produces nothing.
Two networks that take turns
Roughly speaking, the brain has two large networks that alternate. One is active when you are working on a task and points your attention at what you are doing. The other comes up when you are doing nothing in particular: daydreaming, replaying a conversation, worrying about tomorrow. That second network is called the default mode network, because it switches on as soon as there is nothing else to do.
In most people, that default network quietens down reasonably well once they start working. In 2007 Edmund Sonuga-Barke and Xavier Castellanos proposed that in ADHD it works differently. They thought the default network in ADHD keeps flaring up in the background during a task, in a slow rhythm of a few seconds. Every time it flares, it competes with the task. That would explain why people with ADHD perform so unevenly on reaction-time tests: a run of good answers, then a few seconds gone, then good again.
This is called the default-mode interference hypothesis. The word hypothesis is deliberate. It is an explanatory model, not an established fact. Support has been found since. In 2009 Catherine Fassbender and colleagues used brain scans to show that children with ADHD suppressed the default network less during difficult tasks than children without ADHD, and that those who suppressed it less also responded more erratically. It was a small study, twelve children with ADHD and thirteen without, so more of an indication than a proof.
For Tom this means something concrete. The moment he has to switch from 'nothing' to 'task' is exactly the moment when one network has to go quiet and the other has to take over. If that switch is stiff, he stays stuck in between: at his desk, not yet in the task. The write-up is also vague and large, and something vague and large gives the brain little to grab hold of.
Where the shame comes from
What makes this so heavy is what piles on top over the years. Someone who as a child kept hearing 'you are smart enough, you just have to do it' builds a story about themselves. In 2014 Julia Cook and colleagues reviewed the studies on self-esteem in adults with ADHD. There were thirteen, of varying quality, but the direction was always the same: adults with ADHD have lower self-esteem on average, and therapy can partly repair that.
So the shame is neither imagined nor an act. It is the sum of a thousand mornings like Tom's, and of every time someone explained it as a matter of wanting. The awkward part is that shame is itself an activity for the brain. Brooding about not starting is exactly the kind of thing the default network is good at. So it keeps you further from the task.
Two tools and what we know about them
Plenty of tips go around. For two of them we can say what the science shows.
If-then plans
In 1999 the psychologist Peter Gollwitzer described a simple technique. You link a situation to an action in advance. Instead of the intention 'I will write the report today', you say: 'when I have put my coffee down, then I open the document and type the first heading'. He called these implementation intentions. Most people call them if-then plans.
Caterina Gawrilow and Gollwitzer tested this in 2008 with children with ADHD. Children who made such an if-then plan performed as well as children without ADHD on a task where you have to hold back a response. In 2011, together with Gabriele Oettingen, they found that if-then plans also helped children with ADHD switch between tasks and solve maths problems with distractions present. In adults with ADHD this has been studied less directly; the technique is used in cognitive behavioural therapy for adults. The reason it works: the decision has already been made before the moment arrives. You do not have to want anything at that point. You only have to put the coffee down.
Working alongside someone (body doubling)
Many people with ADHD notice that work goes more easily when someone else is in the room who is also working. That person does not have to do anything except be there. In the ADHD community this is called body doubling.
The first academic study of it only appeared in 2023. Tessa Eagle and colleagues asked 220 people, nearly all neurodivergent, how and why they do it. Most had been doing it long before they knew it had a name: in a café, over a video call, with a 'study with me' video on YouTube. The reasons they gave were getting started and staying on task. That is a description of what people do and experience. Whether it actually works better than working alone has not yet been tested in a controlled experiment. What we can say: it costs nothing, it has no side effects and many people swear by it. Try it.
Then there is the five-minute trick: agree with yourself that you only have to work for five minutes, after which you may stop. We know of no study that has tested this specifically in ADHD. The logic does fit what is described above. Five minutes is small and concrete enough to push the default network aside for a moment, and once the task is running, stopping is often harder than continuing.