The Structure of ADHD: A Design Theory of Brain, Relationships, and Work to Turn a Curse into a Blessing

Intro: Viewing ADHD Not as a 'Lack of Ability' but as a 'Problem of State Control'

When we talk about ADHD, we often focus on what people "cannot do."

Inability to concentrate. Forgetting things. Procrastination. Impulsive actions. Inability to read the room. Large emotional swings. Breaking promises. Inability to tidy up.

Listing these characteristics makes ADHD look like a "list of defects."

However, that is only one side of ADHD.

People with ADHD do not simply lack attention. Rather, their attention is directed in too many directions.

They dive abnormally deep into things that interest them, while they can hardly find energy for things they find meaningless.

They cannot tolerate boredom, seek stimulation, fantasize, associate, leap, have sudden inspirations, and sudden depressions.

In other words, ADHD is not a mere "deficit," but a cognitive style involving excess and instability.

The problem is not a lack of ability.

The problem is that the ability is difficult to exercise stably.

This is where the concept of "design" becomes important.

What people with ADHD need is not simply to work harder. It is not to reflect more. It is not to force themselves into the same methods as ordinary people.

What is needed is the following question:

What are the conditions under which this brain works well?

What are the conditions under which this brain is prone to breaking?

What kind of human relationships, environments, and work systems allow these characteristics to emerge as strengths rather than weaknesses?

From this perspective, ADHD is not a "defect to be cured," but a high-sensitivity system that requires ingenuity in handling. In car terms, it is like a Ferrari. It takes more effort to maintain than a normal car, but its performance is high.

Below, we consider ADHD in three layers from this perspective.

In Part 1, we organize what is happening inside the ADHD brain.

In Part 2, we consider how human relationships should be designed.

In Part 3, we concretize how work should be designed.

Part 1: The Essence of ADHD—Not 'Attention Deficit,' but Dysregulation of Attention and Consciousness

1. ADHD is Not a State of 'No Attention,' but 'Wild Attention'

The name ADHD includes the words "Attention Deficit." However, this term is quite misleading.

People with ADHD do not always lack attention. Rather, they concentrate surprisingly well on certain objects. They work for hours forgetting to eat. They continue to think about a single problem to an abnormal degree. They associate deeply, quickly, and widely on themes of interest to the point that others cannot keep up.

Nevertheless, their attention does not turn to detailed daily tasks, boring administrative work, vague requests, or obligations with no visible meaning. Even if they try to direct it, other thoughts immediately enter.

Here lies the essence of ADHD.

ADHD is not a state where attention itself is lacking.

It is a state where the allocation, switching, maintenance, and suppression of attention are unstable.

It is not that there is not enough attention.

It is that the steering wheel and brakes of attention do not work well.

This difference is significant.

**If you think "there is no attention," the solution is "try harder."

However, if you think "controlling attention is difficult," the solution is "create an environment that is easy to control."

**The former is a moral argument.

The latter is a design theory.

What ADHD needs is the latter.

2. TPN and DMN—The Problem of Switching Between Two Networks

Two neural networks, TPN and DMN, are effective in understanding ADHD.

TPN, or Task Positive Network, is activated when tackling external tasks.

Working, writing, calculating, focusing on a conversation, following cooking procedures, driving. At these times, the brain is directed toward external objects.

On the other hand, DMN, or Default Mode Network, is activated when daydreaming, reflecting, remembering the past, imagining the future, or thinking about oneself.

This is not a state of being lazy. It is an important network involved in creativity, meaning-making, memory integration, and self-understanding.

In neurotypical people, these two switch relatively cleanly.

When working, TPN becomes dominant and DMN quiets down. When resting, DMN becomes dominant and TPN relaxes.

However, in ADHD, this switching does not go well.

DMN interrupts during work.

TPN does not stop when one should be resting.

One gets stuck in DMN and sinks into rumination.

One gets stuck in TPN and enters hyperfocus.

What we see here is that the problem of ADHD is not a "lack of concentration," but a problem of switching and adjustment of internal brain networks.

3. Distractibility is the Intrusion of the DMN

The distractibility experienced by people with ADHD during work is not just a light phenomenon of "getting distracted."

They are at their desk. They are trying to read a document. They are trying to reply to an email. Suddenly, a completely different thought enters.

A conversation from yesterday.

Anxiety about the future.

Past failures.

Another idea.

An unfinished errand.

An unrelated question.

Something they suddenly thought to look up.

These can be understood as a state where the DMN is intruding into a scene where one should be working with the TPN.

The problem is that the intruding content is often attractive.

If it were just noise, it could be ignored. But for people with ADHD, the thoughts brought by the DMN often seem interesting. They seem important. They feel urgent. They have a pressure that makes it feel like they must be dealt with right now.

Therefore, attention is easily taken away.

What is important here is that ADHD distractibility is not laziness.

It is not that the person has no motivation. Rather, because multiple objects rise strongly in the brain at the same time, it becomes unstable as to which one attention should be directed toward.

This is not "weak attention," but a state where competition for attention is too strong.

4. Circular Thinking is the Runaway of the DMN

Circular thinking (rumination) is particularly painful as a "curse" of ADHD.

One becomes concerned about something someone said.

One wonders what that expression meant.

One thinks they might have been disliked.

One remembers past mistakes over and over.

One imagines the worst possible developments that could happen.

One thinks of countermeasures, but the more they think, the more anxiety increases.

In this state, the brain seems to be solving problems, but in reality, it is amplifying pain.

→ Continued in the note article "The Structure of ADHD: A Design Theory of Brain, Relationships, and Work to Turn a Curse into a Blessing"