Striped floors and flickering LEDs overload the brain? Researchers reveal: modern design is harming your brain

A review paper published in the journal Vision and completed by more than 30 multidisciplinary scholars suggests that artificial visual patterns such as striped flooring, grid-like architecture, fluorescent light flicker, and LED flicker may overload the brain’s visual cortex by consuming too much oxygen, triggering headaches, nausea, and even inducing epilepsy.

Table of contents

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• The brain goes into alarm
• Who can’t take it first
• From light bulbs to car lights: a flicker history ledger
• When covering a house and doing design, you should think about it
• This is still a hypothesis

Walk into an office building’s elevator lobby, and the floor under your feet is covered by a whole expanse of black-and-white striped carpet; or drive home late at night, and the LED headlights from oncoming traffic suddenly drag a trail of ghost images across your field of view. Your temples start to throb, your eyes feel sore, and you even feel a bit like vomiting—you think it’s because you’re too tired? But a study co-authored by more than 30 multidisciplinary scholars suggests the problem may lie in how the brain operates.

This review paper, produced jointly by scholars from multiple institutions in the United States, the United Kingdom, Europe, Asia, and Canada and published in the journal Vision, pieces together decades of research across neuroscience, architecture, lighting engineering, and educational psychology to explain a phenomenon long treated as a “personal constitution” issue: why do some people get headaches, nausea, and even seizures when they see dense stripes, flickering lights, or high-contrast visuals?

The author group believes this is not a psychological effect, but that the visual cortex is forced into “overload.”

The brain goes into alarm

The human visual system evolved to process natural scenes—forests, rivers, coastlines. These images share a common feature: visual complexity decreases in a predictable way as you look more closely, following something like a fractal mathematical rule. Modern artificial environments, however, often do the opposite: striped wallpaper, grid-like building exteriors, ceiling acoustic panels, and even the layout of printed text all deviate strongly from patterns the brain is accustomed to.

The paper’s authors write:

“We hypothesize that this discomfort is a homeostatic response of the brain to excessive oxygen consumption by the visual cortex, because it is encoding these visual stimuli inefficiently.”

In simple terms, when the brain encounters patterns it “can’t make sense of,” it does not simply adapt. Instead, it cranks up neural activity, consumes more oxygen—like pulling the alarm trigger. Neuroimaging studies show that the brain responses in visual areas to stripes and high-contrast patterns are far greater than those to natural scenes.

Who can’t take it first

Most people sometimes feel, “This image makes me uncomfortable,” but the burden is not distributed evenly. Neurodiverse groups—autism, ADHD, and dyslexia—are hit first; patients with migraine, epilepsy, anxiety, and depression are also high-risk groups. Younger people are more sensitive than older people, and those who get headaches often are similarly prone to being affected.

One possible physiological explanation that spans many of the above conditions is that the brain may lack the ability to inhibit its own excessive overactivity, like a broken dimmer switch.

GABA (an inhibitory chemical messenger, functionally similar to the brake) is considered one of the key suspects, but the authors also emphasize that evidence linking GABA concentration to visual discomfort is “still incomplete.” In studies using the Cardiff hypersensitivity scale, visual sensitivity was divided into four subtypes: patterns, brightness, flicker/motion, and dense visual environments (such as supermarket shelves). The results found that across at least 11 clinical diagnoses, the patterns of discomfort were strikingly consistent; the differences lie only in intensity, not in type.

From light bulbs to car lights: a history ledger of flicker

The tungsten filament in incandescent light retains residual heat between switching on and off, smoothing out much of the flicker. Fluorescent lights are not so fortunate—academia has spent more than 40 years confirming that fluorescent flicker really does trigger headaches.

With LED, the problem takes another form: many LEDs use pulse-width modulation (PWM) to dim the light, switching on and off hundreds of times per second. The flicker is not normally noticeable to the naked eye, but when the eyes move quickly, these flashes and fades leave behind a series of “phantom arrays” on the retina. During reading, this is especially likely to interfere, and migraine patients are particularly sensitive to it.

Some headlamps also use temporal light modulation, which similarly makes these phantom arrays more noticeably annoying. A recent study cited by the research team found that high-frequency temporal light modulation does indeed clearly activate the visual cortex in measurements, not just as a subjective feeling.

When covering a house and doing design, you should think about it

The good news is that many solutions are implemented during the design stage and cost almost nothing. The research team analyzed apartment building images in Google Photos and found that in recent years, the appearance of building exteriors has become increasingly divergent from the natural visual patterns the brain finds easiest to process—replacing early buildings’ organic variations with repeated grids, harsh contrast, and monotonous surfaces.

Specific recommendations include:

• Reduce the contrast of repeated patterns that can’t be avoided
• In lecture halls and conference rooms, avoid using striped acoustic panels
• Before construction, use existing software tools to assess the “visual stress” of building facades or interior spaces

This is still a hypothesis

This review was written jointly by more than 30 scholars from optometry, neuroscience, architecture, lighting engineering, and education, originating from a workshop at the University of London’s Birkbeck College in January 2025. However, the authors are also candid that this is a review integrating existing research—not a new experiment.

At present, methods for measuring visual sensitivity are still overly subjective and insufficiently standardized. As for “the relationship between brain excitation and inhibition chemical signals and visual discomfort,” using the authors’ own words, it remains undecided.