The ADHD Brains That Perform Worse With White Noise

We have published three posts on this site arguing that background noise measurably improves attention in ADHD brains. The evidence for that claim is real. It is also an average, and averages conceal people.

Two recent lines of research complicate the picture. One shows that a meaningful share of children with a clinical ADHD diagnosis perform worse under noise, not better. The other suggests that the mechanism everyone has been citing, including us, may not be what is actually happening.

Neither finding makes the tool useless. Both change how you should test it.

The key facts

• The headline effect size of g=0.25 is a group mean, not a description of any individual.
• In a clinical ADHD sample, benefit was not uniform, and hyperactive or impulsive profiles sometimes declined.
• A 2025 study of 59 children found an effect on one alertness measure and nothing else.
• A 2025 EEG study found a pure tone produced virtually the same neural effect as pink noise.
• The same study found elevated ADHD traits came with more baseline neural noise, not less.

The average hides two groups

The Nigg et al. (2024) meta-analysis in JAACAP remains the strongest summary of the field: 13 randomized studies, 335 participants, g=0.25 for ADHD groups and g=-0.21 for neurotypical comparison groups. That contrast is robust and it is why the topic is taken seriously at all.

An effect size of 0.25 describes a distribution shifting slightly. Plenty of individuals inside that distribution moved the other way.

A 2024 study in the Scandinavian Journal of Child and Adolescent Psychiatry tested 43 children with a clinical ADHD diagnosis on a visuospatial working memory task under controlled auditory and visual white noise. The group did not benefit uniformly. Children with more inattentive presentations improved. Children with more hyperactive or impulsive presentations sometimes performed worse.

That result is consistent with the arousal account rather than a refutation of it. If the curve relating noise to performance is an inverted U, and if hyperactive presentations sit closer to or above their optimal arousal point already, then adding noise pushes them past it. The same logic that predicts a benefit for one profile predicts harm for another.

A 2025 replication that found much less

A study published in 2025 in the European Journal of Special Needs Education tested 59 children aged 5 to 12, of whom 36 had ADHD. Each child completed attentional tasks twice, once wearing headphones playing white noise and once with no noise, on separate dates.

Children with ADHD showed shorter reaction times on an alertness task under white noise. On the other outcomes investigated, there was no difference. And for the children without ADHD, white noise produced no difference at all.

That last part is worth noting, because the impairment half of the story is a large part of what makes the ADHD finding striking. A study that finds neither the broad benefit nor the neurotypical cost is a meaningfully weaker result than the meta-analytic average suggests.

The mechanism is in trouble

Every post on this site has explained the effect through the Moderate Brain Arousal model and stochastic resonance: ADHD brains carry less internal neural noise, external random noise tops it up, and detection of weak signals improves. It is an elegant account and it makes testable predictions. Two recent studies tested them.

Rijmen, Senoussi and Wiersema published a study in the Journal of Attention Disorders in 2025 with 69 adults, measuring ADHD traits by self-report and recording resting-state EEG in three conditions: silence, pink noise, and a 100 Hz pure tone. A pure tone is not random, so stochastic resonance predicts it should not work the way noise does.

Both sounds produced virtually identical effects on the aperiodic slope, the EEG measure used as a proxy for background neural noise. Both reduced it in participants with elevated ADHD traits. Beyond that, participants with elevated ADHD traits showed more baseline neural noise, not less, which inverts the model’s starting assumption. A 2024 paper in Neuropsychologia, asking directly whether stochastic resonance is required for pink noise to benefit ADHD-related performance, reached a similar conclusion.

What this changes and what it does not

A behavioural effect can be real while its explanation is wrong. People have reported for decades that noise helps them work, and multiple labs have measured improvements on attention tasks. None of that is retracted by a failed mechanistic prediction.

What changes is the shape of the advice. If a 100 Hz tone moves the same EEG marker as pink noise, randomness may not be the active ingredient, and the specific noise colour may matter less than having a steady sound present at all. It also means the confident explanations circulating online, ours included, are further ahead of the evidence than they sound.

How to actually test it on yourself

Given a small average effect and large individual variation, the group data cannot tell you what to do. Your own data can:

• Pick one task you do regularly and can measure: pages read, problems completed, a timer that tracks focused minutes.
• Alternate conditions by day rather than switching whenever you feel like it. Choosing noise on hard days and silence on easy days guarantees a misleading answer.
• Hold the volume constant. Changing level and noise type at the same time tells you nothing about either.
• Run it for at least two weeks. Novelty effects fade and you want the steady state.
• Take a decline seriously. Performing worse under noise is a documented outcome, not a sign you are doing it wrong.

Tools worth trying

• Mynoise.net — the best free option for isolating one variable at a time
• Brain.fm — subscription focus audio
• Noisli — simple mixer for web and mobile

Noise Box is useful for this kind of self-testing because presets make a condition reproducible. Save the exact mix and level you are testing so that week two is the same stimulus as week one, and keep a second preset to compare against. A test where the stimulus drifts is not a test. No account required, and the core features are not paywalled.

Download Noise Box on Google Play

The takeaway

The evidence for noise and ADHD attention has held up as a group finding and has not held up as a universal one. Within a clinical sample, inattentive profiles improved and hyperactive profiles sometimes got worse. A 2025 replication found a single narrow effect. The stochastic resonance explanation lost a direct test to a pure tone.

The practical conclusion is unchanged in one respect: this remains a low-cost, low-risk thing to try. What should change is the confidence. Treat noise as a personal experiment with a real chance of a negative result, and let your own measurements outrank the meta-analysis.

Sources: Nigg et al. (2024), JAACAP — full meta-analysis; sensory white noise in clinical ADHD: who benefits, who performs worse; acoustic stimulation to improve attention in children with ADHD (2025); Rijmen, Senoussi & Wiersema (2025), Journal of Attention Disorders — coverage of the EEG study; Rijmen & Wiersema et al. (2024), Neuropsychologia — is stochastic resonance required?