What Is Impulsivity in ADHD and How It Shows in Daily Life

There have been many times when I wished I had not said a sentence the moment I said it. Even as it left my mouth I knew it was wrong; I just could not stop it from coming out.

For a long time I took this to be a matter of upbringing. I thought I was an impatient person and that I needed to learn to hold myself back. I tried very hard to hold myself back. Sometimes I managed. But every time I held back I got incredibly tired, and on the evenings I was tired I could not hold back at all.

The common name for these is impulsivity, and it is one of the three core symptom clusters of ADHD. In this article I want to separate out the mechanism, because learning the mechanism was what reduced my guilt and changed the solution.

What impulsivity is, exactly

Impulsivity is reacting to a wish or a stimulus before there is time to weigh the consequence.

Everyone behaves impulsively from time to time. In ADHD the difference is in the frequency and cost of this reaction. If impulsive decisions leave regret, debt, a broken relationship or risk in the same place again and again, it can be more than a personality trait.

Researchers do not treat impulsivity as one thing. It has at least two faces, and the two are fed by different mechanisms. When I learned this distinction I began to classify my own states, and for the first time I could see what was what.

The first face: the delayed brake

According to Barkley's (1997) influential model, at the center of ADHD lies a difficulty in stopping behavior.

When a stimulus arrives, the mind does two things: it prepares a reaction, and it holds that reaction for a moment and checks "now? is it appropriate?" The second step, the brake, works slowly or inconsistently in ADHD.

The result is this: the reaction comes out before the control kicks in.

Its everyday equivalents:

• Interrupting. The sentence that comes to mind comes out before your turn.
• Being unable to wait your turn. In a queue, in a conversation, in a chat.
• Sudden answers. A reply given before the question is finished.
• A message sent without thinking. It goes the moment it is written and cannot be taken back.

What I do most often is interrupt. It took me a long time to notice that it is not from disinterest: on the contrary, it happens because I am very interested. I know that if I cannot say what comes to mind I will lose it, and that fear works faster than the brake.

The second face: being unable to wait

Sonuga-Barke's (2003) dual pathway model adds a second mechanism: differences related to waiting and reward.

On this path the issue is not the brake itself but the timing of the reward. A small reward that comes immediately feels more attractive than a larger reward that will come after a while. The waiting time is experienced as a kind of discomfort.

The meta-analysis by Patros and colleagues (2016) shows that the tendency to choose the small, immediate reward is markedly stronger in children and adolescents with ADHD. This is called choice impulsivity; its counterpart in the glossary is delay of reward.

Its everyday equivalents:

• Sudden purchases. Buying now instead of waiting.
• Postponing long-term goals. Savings, health, everything whose reward is far away.
• Leaving a boring task to move to a more enjoyable one.
• Choices that give quick results but whose price comes later.

The delayed brake makes you say "I did it without thinking." Being unable to wait makes you say "I knew, but I couldn't wait."

Which areas of life it leaves a mark on

The cost of impulsivity shows up less in a single mistake than in the accumulation.

Money. Sudden purchases, forgotten subscriptions, spending done without thought. The details are in the article on ADHD and money management.

Relationships. Interrupting, saying something hurtful on the spot, being unable to step back in an argument. It can look like indifference to the other side, and I think this is the most unfair misunderstanding. The details are in the article on ADHD and relationships.

Work. Jobs accepted without planning, promises made without thinking, sudden decisions. While running my own company, my most expensive mistakes were always "saying yes in that moment." The same applies in a pricing conversation; I wrote about that separately.

Traffic. The review by Barkley and Cox (2007) shows that risk-taking, speed and crash rates in traffic are higher in ADHD, and that stimulant medication treatment can improve driving performance.

Health. Risky behavior, substance use and accidents. The international consensus statement emphasizes that untreated ADHD is associated with an increased risk of accidents and injuries (Faraone et al., 2021).

The cycle of regret

The most tiring side of impulsivity comes afterward.

A decision is made, its result is seen, regret comes, a promise is made not to do it again. Then the same situation repeats and the same thing happens.

As this cycle repeats, the person begins to distrust themselves. The sentence "I did it again" turns over time into a sentence about identity. For a period it took this shape in me: I began to avoid making decisions, because I assumed that every decision I made would be a bad one.

The important point here is this: when impulsivity is treated as a problem of intention, the solution becomes "be more careful," and this never worked for me. When it is treated as a mechanism, the solution moves to structure, and structure is more reliable than willpower.

What works

The essence is this: putting an artificial distance between decision and action.

The waiting rule. Making a purchase above a certain amount one day later. Add to basket, do not buy. In the glossary it appears as the waiting rule, and it is one of the few rules that really works for me.

The drafts rule. I do not send a message I wrote while angry or excited. I leave it in drafts and read it again after a while. My deletion rate is high.

Adding friction. Deleting the card from the phone, removing shopping apps from the home screen. Making spending one step harder puts a small obstacle in front of the sudden decision.

Keeping the sentence "let me think about it" ready. Instead of a sudden "yes" when a new task is asked of me, this sentence. It does not come out of my mouth unless it is ready, so I memorized it.

Taking notes against interrupting. Writing down what comes to mind during a conversation reduces the fear of losing it and makes waiting for my turn easier. This was the single move that helped me most.

Knowing the triggers. Impulsivity rises with tiredness, hunger, lack of sleep and when you are emotionally loaded. Leaving important decisions for a time away from these states does not improve the decision itself; it improves the person making the decision.

Distance instead of willpower. Instead of trying to be strong against the impulse, putting time between the impulse and the action works more reliably. A wait of ten minutes is the time in which most sudden wishes die out.

The role of treatment

It is known that the medications used in ADHD can reduce the symptoms of impulsivity. Which medication suits whom and at which dose is the doctor's decision; the general framework is in the article on ADHD medication treatment.

On the psychological side, cognitive behavioral therapy works on skills aimed at noticing decision moments and developing alternative reactions.

What I learned

In the years when I carried impulsivity as a character flaw, I had a single strategy: trying harder. Things went as well as I tried, and when my effort ran out everything came back.

Now I spend the effort at the setup stage. Deleting the card is done once; trying not to type that card in every time is done every day. The difference is the energy left over for me.

For stopping and thinking at the moment of impulse, I also prepared an ADHD Checkpoint: a ten-minute wait, a body check, and warnings for weak points such as addiction, sexuality, anger and money, with support lines, all there.