Understanding How Dopamine Works for ADHDers

Dopamine has been dubbed “the reward chemical”. However, neuroscience shows us that the chemical activities that dopamine is involved in is actually more like the train signalling system. Here is the metaphor:

In a Neurotypical Brain

When a task appears, the brain sends a dopamine signal.

• That signal says: “This task is worth starting.”

• The signal turns the green light on.

• The passengers (AKA: your thoughts, motivation, focus, and emotional energy) get onto the train

• And the train leaves the station.

As the train moves along the track, dopamine continues to signal:

• stay on track

• keep going

• you’re getting closer to the reward

When the task is finished, the brain releases a reward signal that feels satisfying. So the whole system works like a well-timed railway network. Task gets done, it feels appropriately positive and the cycle continues.

In an ADHD Brain

The task appears, and the dopamine signal that says “start the task now” is weaker or inconsistent. Even if you want to, intend to, and even care deeply about the task:

• The green light doesn’t switch on easily.

• So the train simply stays at the station, or has trouble moving forward. Or exits the station late.

This is why ADHD is often described as a difficulty with activation, not just attention.

• Then the passengers (AKA: your thoughts, motivation, focus, and emotional energy) are also not very reliable at getting on the train effectively. Or they start to get on the train but then the train isn't moving as it should and the passengers slowly get off the train.

• The train then, if it’s lucky, chugs along the track until it gets to the reward centre- if it even makes it there!

• Additionally, there is also a chance the reward centre doesn’t show quite as much excitement when the train arrives as what you thought it should.

So the ADHDer brain may experience quite a lot of difficulty in completing the task. Then, even if the task is done, the reward signal does not always feeling appropriate. Sometimes, this is also because the brain is stuck in self criticism, saying things like "I should have done it faster", "I am lazy", "whats wrong with me". The ADHDer brain may feel a lot of negative overwhelm and then it may become even more difficult next time the task is to be completed.

Why Interest and Urgency Change Everything

Certain things create a huge dopamine signal, especially for ADHDers:

• novelty

• urgency

• competition

• emotional intensity

• interest

When that happens, the signal lights all turn green and the train leaves immediately.

This is why ADHD brains can suddenly perform at an extremely high level when something is interesting or urgent.

The Important Takeaway

ADHD is not a lack of intelligence, or laziness. It is a difference in how the brain signals motivation and action. Once you understand the railway system, you can start building supports that help the trains move more smoothly.