Brown Noise vs White Noise: Which Helps You Focus?
Roon Team
Brown Noise vs White Noise: Which Helps You Focus?
Brown noise is white noise with the high frequencies turned down, so it sounds like a low rumble instead of a hiss. For focus, neither has strong evidence over the other. A 2024 meta-analysis of 13 studies found white and pink noise gave a small attention benefit to people with ADHD symptoms and slightly hurt people without them. Brown noise has not been studied for focus at all. Pick by comfort, keep volume low, and run your own one-week test.
Key Takeaways
- White and pink noise help a narrow group. Across 13 studies (n = 335), white and pink noise improved task performance in people with ADHD or high ADHD symptoms (effect size g = 0.249) and worsened it in people without (g = −0.212).
- Brown noise is unstudied. No controlled trial has measured brown noise and attention. Every "brown noise for focus" claim you see online borrows from white or pink noise data.
- Volume matters more than color. A 2022 study found quiet white noise (45 dB) improved sustained attention and lowered stress, while louder noise (65 dB) improved working memory but raised stress.
- About one third of people with ADHD do worse with noise. Inattentive traits predict benefit; hyperactive traits predict harm (Söderlund et al., 2024).
What Is the Difference Between Brown Noise and White Noise?
The difference is where the energy sits in the frequency spectrum. White noise spreads power equally across all frequencies. It sounds like TV static. Brown noise rolls off steeply, losing about 6 dB per octave, so it sounds like a deep rumble or distant waterfall. Pink noise splits the difference at −3 dB per octave and sounds like steady rain.
| White Noise | Pink Noise | Brown Noise | |
|---|---|---|---|
| Energy distribution | Equal power per hertz (flat spectrum) | Equal power per octave (1/f) | Power proportional to 1/f² |
| Slope | 0 dB/octave | −3 dB/octave | −6 dB/octave |
| Sounds like | TV static, hissing | Steady rain, rustling leaves | Distant thunder, waterfall |
| Everyday comparison | Untuned radio | Light rain on a window | Jet cabin hum |
| Focus research | Studied in ~13 trials | Studied in several trials | Zero controlled studies |
A note on green noise. You will see "green noise" in playlists and apps. It is a marketing term for mid-frequency, nature-like noise. There is no standard technical definition and no slope figure. Treat it as a branding choice, not a signal-processing category.
Is Brown Noise or White Noise Better for Focus?
There is no head-to-head study. The best evidence comes from a 2024 systematic review and meta-analysis led by Joel Nigg at Oregon Health & Science University, published in the Journal of the American Academy of Child and Adolescent Psychiatry. The team pooled 13 studies (n = 335, children and college-age young adults):
- ADHD or high ADHD-symptom groups: small but significant benefit (g = 0.249, 95% CI 0.135 to 0.363, p < .0001).
- Non-ADHD comparison groups: small negative effect (g = −0.212, 95% CI −0.355 to −0.069, p = .0036). Noise made them perform worse.
- Brown noise: "No studies of brown noise were identified."
That last line is the fact no other ranking page leads with. Every claim that brown noise helps focus borrows from white and pink noise data and assumes the benefit transfers. It might. But nobody has tested it.
Why Does Noise Help Some People Concentrate and Distract Others?
Two mechanisms. First, steady noise masks sudden sounds (speech, door slams, phone buzzes) that pull attention away. That is why open-office noise recovery is a real productivity problem.
Second, the stochastic resonance hypothesis. Söderlund, Sikström, and Smart (2007) tested the Moderate Brain Arousal model: people with lower baseline dopaminergic tone (common in ADHD) need more external stimulation to reach optimal cognitive performance. People already at or above the optimum get pushed past it, and their performance drops.
A 2024 clinical study by Söderlund et al. complicated the picture. In 43 children with clinically diagnosed ADHD, about one third performed worse under white noise (~80 dB through headphones). Inattentive traits predicted benefit; hyperactive/impulsive traits predicted harm. Noise is a tool with responders and non-responders, even within ADHD.
Does Brown Noise Help ADHD?
Honestly: nobody knows. Brown noise has not been tested in any controlled trial for attention or ADHD.
The trend exploded on TikTok in summer 2022. The Washington Post covered it in November 2022, and ADDitude Magazine reported similar anecdotes. These are personal accounts, not evidence. Brown noise may work for the same masking and arousal reasons white noise does. Or the deep rumble may simply feel more pleasant, and comfort drives compliance.
One sentence worth sitting with: if attention problems are disrupting your work, relationships, or daily life, that is a conversation for a clinician, not a playlist. For practical strategies alongside professional guidance, see focus strategies for ADHD.
What About People Without ADHD?
The Nigg meta-analysis found a small negative effect on non-ADHD groups. A 2022 study by Awada et al. in Scientific Reports (39 neurotypical graduate students) adds nuance: white noise at 45 dB improved sustained attention and lowered stress, while 65 dB improved working memory but raised stress.
Quiet noise can still help neurotypical workers by masking irregular office sounds. But turning the volume past a soft hum likely does more harm than good. Deep work tasks (reading, writing, analysis) are the ones most disrupted by variable background sound.
How Loud Should Focus Noise Be?
Keep it near conversation-quiet: around 40 to 50 dB. The EPA identifies 70 dBA averaged over 24 hours as the threshold that prevents hearing loss over a lifetime. NIOSH's recommended exposure limit is 85 dBA over an eight-hour shift, with allowed time halving for every 3 dBA increase.
Many ADHD lab studies used approximately 80 dB through headphones. That is a lab condition for short task blocks, not an eight-hour work setting. OHSU's own press release on the Nigg meta-analysis warned that "damage to hearing is a significant risk if noise volumes are not carefully monitored." If you need to raise your voice to talk over your noise, it is too loud.
How to Test Brown vs White vs Pink Noise on Yourself in One Week
The research cannot tell you which color works best for you. A simple self-experiment can.
- Pick one task type you do daily (writing, problem sets, reading). Keep it consistent.
- Same time of day, same duration. 25 to 50 minute blocks work well.
- Rotate conditions. Day 1: silence. Day 2: white noise. Day 3: pink noise. Day 4: brown noise. Days 5 through 7: repeat the top two plus silence.
- Log output. Words written, problems completed, pages read. Also note how tired your ears feel at the end.
- Keep volume at conversation-quiet. Use a free decibel meter app to check.
For verbal memory tasks (memorizing terms, processing dense text), silence tends to win. For sustained-attention work in a distracting environment, noise earns its keep. For more on sound and productivity, see whether music helps you focus and binaural beats evidence.
The Verdict on Brown Noise vs White Noise
Choose by comfort. The evidence does not separate brown from white because brown has never been tested. White and pink noise show a small benefit for people who are easily distracted or under-stimulated, and a small cost for people who are not. Volume matters more than color: quiet noise masks distractions without adding physiological stress, while loud noise does the opposite.
Try each color for a few days, measure your output, and keep the one that helps. If none does, silence is free.
Frequently Asked Questions
Is brown noise better than white noise for studying?
No study has compared the two for studying. White and pink noise show a small benefit in people with ADHD symptoms across 13 studies, and a small negative effect in people without them. Brown noise may work similarly because it also masks environmental sound, but that is an assumption, not a finding. Try both at low volume and track your output.
Is pink noise or brown noise better for focus?
Pink noise has appeared in several controlled studies; brown noise has not. Pink noise drops 3 dB per octave (steady rain); brown drops 6 dB per octave (deep rumble). If evidence matters to you, pink has more support. If comfort matters more, choose whichever you can listen to for an hour without fatigue.
Is it OK to listen to brown noise all day?
At low volume (40 to 50 dB), there is no established hearing risk for eight hours. The EPA recommends staying below 70 dBA averaged over 24 hours to prevent lifetime hearing loss. The risk rises with volume and headphone use. Use a decibel meter app and stay under 60 dB to be safe.
Does brown noise help you sleep as well as focus?
Brown noise is popular for sleep, but most sleep-noise research has used white or pink noise. The deep, low-frequency profile may feel more soothing to some people, but that is preference, not a studied outcome. Keep volume low and set a timer.
What is green noise?
A marketing term for mid-frequency noise that sounds like nature (wind, streams, rustling). It has no standard definition in signal processing and no assigned spectral slope. Some apps label nature soundscapes "green noise" to differentiate from white, pink, and brown.
Why is it called brown noise?
It is named after Robert Brown, the 19th-century botanist whose observations led to the concept of Brownian motion. The signal mimics the random movement pattern Brown described in pollen particles. It has nothing to do with the color. The alternative name is "red noise," placing it on the warm end of the light-spectrum analogy used for noise colors.
Sound Sets the Room. It Does Not Wake You Up.
Noise manages your environment. It masks the door slam, the coworker's call, the irregular sounds that yank attention. For under-stimulated brains, it nudges arousal toward a productive range. That much is real.
What noise cannot do is fix the 2 p.m. slump or the foggy start after a short night. Alertness is a separate variable, and it is exactly what the noise-responders in the studies lacked. A 2025 meta-analysis in Nutrition Reviews found that L-theanine plus caffeine improved attention-switching accuracy and self-reported alertness in healthy adults.
Roon is a zero-nicotine oral pouch built around that pairing: 80 mg caffeine, 60 mg L-theanine, 25 mg methylliberine (Dynamine), 5 mg theacrine (TeaCrine). Methylliberine slows caffeine clearance. In a randomized, double-blind, crossover PK study (n = 12), co-administration cut caffeine's oral clearance from 41.9 to 17.1 L/hr and extended its half-life from 7.2 to 15 hours, with no higher peak (study). Important context: that study used 100 mg methylliberine + 150 mg caffeine, roughly 4x the methylliberine and 1.9x the caffeine in Roon's formula. The mechanism is directionally the same at Roon's doses, but the magnitude has not been measured there. Felt window: 6 to 8 hours per pouch, onset in 5 to 10 minutes. Trade-off: stop at least 8 hours before bed.
Roon is not a noise app and not a replacement for a clinician. It is caffeine, engineered to last longer without spiking higher. From $9.16 per tin subscribed. Pair it with whichever noise color won your one-week test.
Related from Roon
- Does Music Help You Focus? What the Research Says
- Do Binaural Beats Work for Focus?
- Open-Office Noise: The Hidden Cost of Distraction Recovery
- How to Focus With ADHD
Written by Roon Team
