How light meditation works

A light flickering at a steady rate between roughly 5 and 50 times a second, seen through closed eyelids, makes most people see color and simple geometric pattern within a minute or two. The patterns are produced by your own visual system responding to the rhythm. Nothing is being shown to you.

By the team that makes Auralis · Updated October 14, 2026

The effect is strongest around 10 flashes a second, the alpha range. It depends on the flashes being evenly spaced. When researchers kept everything else the same and only made the timing irregular, the visuals dropped sharply. That is why Auralis holds each rate steady for a minute or more and moves between rates slowly.

What you see and why

Rhythmic light drives a matching rhythm of activity in the visual cortex, which researchers can measure as a steady-state response that builds over several seconds of unchanged stimulation. Through closed eyelids the light is a broad, even glow, so there is no image for the brain to work with. What people report instead are simple, repeating forms: grids, lattices, spirals, tunnels and checkerboards, usually in vivid color.

These are the same families of shape the psychologist Heinrich Klüver cataloged in the 1920s. They turn up across very different triggers, from flicker to migraine aura. A 2025 review in Neuroscience of Consciousness by researchers at Sussex, Berlin and elsewhere is the best single summary of what is known about them.

Which rates work

Auralis anchors every session at about 10 Hz and moves between 5.5 and 12.5 Hz. It never enters 15 to 20 Hz. One study found 18 Hz effective. We give it up on purpose: an app with no medical screening should not sit in the band where photosensitive seizures are most likely. More on safety.

How strong is it?

In a 2021 study in PLOS ONE, 20-minute eyes-closed sessions at 10 Hz led 21 participants to report forms or patterns, against 9 at 3 Hz. On one specific measure, the "elementary imagery" scale, ratings were comparable to those reported for 100 micrograms of LSD.

That comparison is often quoted loosely, so to be precise: it matches simple geometric imagery on one narrow scale. It is not a psychedelic experience. People who expect one are usually disappointed. People who come for the colors usually are not.

The lab rigs in these studies are also far brighter than a phone, at 1,000 to 5,000 lumens against roughly 50 for a phone's flash. That is the main reason a dark room and holding the phone close matter so much.

Why the rhythm is held steady

A 2023 study held the rate and the total amount of light constant and changed only whether the flashes were evenly spaced. Irregular flashing strongly reduced the visuals, most of all at 10 Hz, the rate that is otherwise the strongest. A light that keeps sliding between rates looks irregular to the visual system too, so Auralis holds each rate for a minute or so and changes rate slowly and deliberately.

What Auralis does vary is brightness, on a slow 12-second swell. Moving the phone closer and further away changes mostly how much light reaches the eye, so the app reproduces that without touching the timing.

What the sound does

Each session pairs the light with audio. Binaural beats, two slightly different tones in each ear, are the more commonly marketed half of products like this. The evidence for them is weaker than for the light. Controlled trials find they reliably reduce anxiety, including before surgery. Whether they synchronize brain rhythms the way flicker does is genuinely unresolved. A 2023 systematic review found the results inconsistent.

So in Auralis the sound is there to hold the mood and make the session easier to stay inside. Binaural sessions need headphones; Flow uses a pulse in the sound itself, which also works on a speaker.

What the research does not show

• That light meditation treats any condition. Auralis is a relaxation app and makes no medical claims.
• That one rate is "the" frequency for sleep, focus or anxiety. The bands describe what brains do in those states, not a dial you can turn.
• That 40 Hz flicker, studied for Alzheimer's disease, is related to this. It is a different question, studied with different equipment. It is not what Auralis does.

Getting the most from a session

• Dark room, eyes closed, flash 5 to 10 cm from your face. Stray light washes the effect out, even through eyelids.
• Give it a few minutes. The response builds over seconds and the imagery over minutes. The strongest phases come after the opening.
• Do as little as possible. Notice what appears without steering it. Trying to force a particular image reliably prevents it.
• Let it finish. Sessions settle back to 10 Hz and fade out rather than stopping abruptly.