Science
When light interacts with the brain
LuminoMind is based on a phenomenon studied in neuroscience for several decades: the brain’s ability to respond to rhythmic sensory stimulation, particularly light stimulation.
When light varies regularly at a given frequency, the brain’s electrical activity can show a periodic response linked to that stimulation. In electroencephalography, this phenomenon is studied under terms such as photic driving, steady-state visual evoked potentials (SSVEP) or, depending on the experimental context, neural entrainment.[1][2]
This principle provides the scientific basis for the light sequences used by LuminoMind.
The brain is sensitive to light rhythms
The brain itself operates through many oscillatory processes. Some electrical activity observed with EEG is conventionally grouped into frequency bands such as delta, theta, alpha, beta and gamma.
When visual stimulation is presented repeatedly and regularly, the visual system produces an electrical response at the stimulus frequency or at some of its harmonics.
This is therefore more than simply seeing a light flash: the brain’s response to this periodicity can be measured directly using EEG.
Experimental research shows, in particular, that the timing regularity of the stimulus is essential. Notbohm and Herrmann observed that regular visual stimulation in the alpha band could interact with the brain’s alpha oscillations, whereas irregularly timed stimulation did not produce the same phenomenon.[2]
This is why LuminoMind does not generate random flashing: its sequences precisely control the frequency, intensity, modulation pattern and how these change over time.
Stimulation frequency matters
Not all light frequencies produce the same response.
One extensively studied range is the alpha band, approximately 8 to 13 Hz.
In a study published in the Journal of Neuroscience, Gulbinaite and colleagues investigated the effect of 10 Hz visual stimulation during an attention task. The researchers observed a frequency-dependent interaction between the light stimulus and each participant’s own alpha activity.[3]
A particularly interesting finding was that the response depended on how close the stimulation’s 10 Hz frequency was to the individual’s own alpha frequency.[3]
This highlights two important points:
- the brain is sensitive to the exact stimulation frequency;
- the response can vary from person to person.
The same light sequence can therefore produce a different experience depending on the person, their current state and their own brain dynamics.
Why can we see shapes and colours with our eyes closed?
One of the most surprising effects of rhythmic light stimulation occurs when the light is used with eyes closed.
Although no image is displayed on a screen, some people report:
- colours;
- geometric shapes;
- tunnels or repeating structures;
- movement;
- kaleidoscopic patterns;
- unusual sensations of space or depth.
These phenomena have long been known in neurophysiology.[4]
A controlled study published in 2021 by Bartossek, Kemmerer and Schmidt specifically investigated this phenomenon. Twenty-four participants were exposed, with their eyes closed, to light stimulation at 3 Hz and 10 Hz.[5]
The researchers observed temporary changes in conscious experience accompanied by intense visual phenomena, including colours and geometric patterns. The effects were particularly pronounced in the 10 Hz condition.[5]
These experiences were measured using psychometric scales used in research on altered states of consciousness.
This is one of LuminoMind’s most surprising features: the perceived images do not come from a screen. They are generated by the visual system and the brain in response to light stimulation.
What happens in the brain?
The phenomena produced by pulsed light do not appear to involve only the retina or the early stages of visual processing.
Recent neuroimaging research suggests that broader networks are involved, connecting, in particular, the thalamus and the visual cortex.
A study using functional MRI observed that rhythmic light stimulation could temporarily alter connectivity between the lateral geniculate nucleus, other thalamic nuclei and various cortical regions.[6]
Some of these changes were associated with the intensity of the visual phenomena reported by participants.
This research offers a neuroscientific explanation that may help us understand why a relatively simple stimulus — light whose intensity changes rapidly — can generate an extremely rich perceptual experience.
From visual activity to states of consciousness
The scientific history of these phenomena goes back a long way.
Intermittent light stimulation has long been used in electroencephalography to observe the brain’s response to different light frequencies.
Early neurophysiologists had already noticed that certain frequencies could produce particularly elaborate perceptions of shapes, colours and movement in awake people with their eyes closed.[4]
In the 1960s, artist Brion Gysin turned this observation into an artistic experience with the well-known Dreamachine, a device using rhythmic light viewed with eyes closed.
The history of these experiences was the subject of a publication in European Neurology, tracing the transition from the stroboscope used in neurophysiology to the Dreamachine and the modern study of light-induced visual hallucinations.[4]
Today, EEG and brain imaging tools allow scientists to study phenomena that were once described mainly in subjective terms.
Can sensory stimulation influence attention?
Research is not limited to visual phenomena.
Rhythmic sensory stimulation is also being studied for its possible effects on various cognitive functions.
A recent study published in Imaging Neuroscience exposed 62 adults to audiovisual stimulation at 40 Hz, non-rhythmic stimulation or a control condition during a vigilance task.[7]
On average, the group exposed to 40 Hz stimulation showed:
- greater accuracy;
- faster reaction times;
- increased EEG activity at 40 Hz;
- as well as changes in other oscillations and brain connectivity associated with attentional performance.[7]
These findings are particularly interesting, but they should be interpreted with caution: a given frequency cannot automatically be associated with a specific mental state in everyone.
Other studies have sometimes observed different effects, including poorer performance on some attention tasks when stimulation interfered with spontaneous brain oscillations.[3]
It is precisely this complexity that makes research into neural entrainment particularly interesting.
Relaxation, attention and pain: active areas of research
Rhythmic sensory stimulation is currently being researched in several areas, including cognition, sleep, mood, pain perception and neurological conditions.
An integrative review published in 2025 analysed 84 studies on Brainwave Entrainment through auditory or visual stimulation.[8]
The authors report encouraging findings in several areas, including cognition, sleep, mood and pain, while emphasising the need for more randomised trials with control groups and larger samples.[8]
An earlier review by Huang and Charyton had already identified findings relating to cognitive performance, stress, anxiety, mood and pain perception, among other areas.[9]
The research is therefore promising, but effects depend strongly on the protocols used, the frequencies, the duration of stimulation and individual characteristics.
An example: pain perception
An experiment conducted by Ecsy, Jones and Brown separately investigated visual and auditory stimulation at 8, 10 and 12 Hz.
After ten minutes of visual stimulation using LED glasses, the researchers observed lower subjective ratings of experimentally induced pain compared with a control condition.
In the visual condition, the effect was greater at 10 Hz than at 8 or 12 Hz.[10]
This finding once again illustrates the potential importance of stimulation frequency.
It does not, however, mean that light stimulation is a treatment for pain. It shows that subjective perception can be influenced experimentally by certain forms of rhythmic sensory stimulation.
A different experience for every brain
The scientific literature also shows why two people using the same stimulation do not necessarily have the same experience.
The response depends, in particular, on:
- the frequency used;
- the individual’s alpha frequency;
- the stimulus intensity;
- timing regularity;
- the duration of exposure;
- the attentional state;
- and individual characteristics.[2][3][5]
In the study by Bartossek et al., for example, an individual’s tendency towards psychological absorption was strongly associated with the intensity of the reported changes in consciousness.[5]
There is therefore no simple equation such as:
“10 Hz = relaxation” or “40 Hz = concentration”.
Brain function is far more complex.
Instead, LuminoMind uses the possibility of creating complex light patterns over time, made up of frequencies and modulations that evolve during a session.
LuminoMind and scientific research
LuminoMind does not display any images in front of the eyes.
The device creates precisely controlled light sequences designed for use with eyes closed.
The sequences can vary several stimulation parameters over time: frequency, intensity, modulation and combinations of rhythms.
This approach draws directly on phenomena documented in scientific research:
rhythmic light stimulation → response of the visual system → frequency-dependent brain activity → possible changes in perception and certain cognitive processes.
LuminoMind aims to use these phenomena to create experiences that, depending on the programme, support relaxation, meditation, perceptual exploration or certain states of attention.
It is important, however, to distinguish the neuroscientific mechanisms being studied from clinical applications.
LuminoMind is not presented as a medical treatment, and findings from studies using other devices or protocols cannot be directly attributed to LuminoMind.
Research into rhythmic sensory stimulation is evolving rapidly, and many questions remain to be explored.
Scientific references
[1] Regan, D. (1989). Human Brain Electrophysiology: Evoked Potentials and Evoked Magnetic Fields in Science and Medicine. Elsevier.
[2] Notbohm, A., & Herrmann, C. S. (2016). Flicker Regularity Is Crucial for Entrainment of Alpha Oscillations. Frontiers in Human Neuroscience, 10, 503. DOI: 10.3389/fnhum.2016.00503.
[3] Gulbinaite, R., van Viegen, T., Wieling, M., Cohen, M. X., & VanRullen, R. (2017). Individual Alpha Peak Frequency Predicts 10 Hz Flicker Effects on Selective Attention. Journal of Neuroscience, 37(42), 10173–10184. DOI: 10.1523/JNEUROSCI.1163-17.2017. PMID: 28931569.
[4] ter Meulen, B. C., Tavy, D., & Jacobs, B. C. (2009). From Stroboscope to Dream Machine: A History of Flicker-Induced Hallucinations. European Neurology, 62(5), 316–320. DOI: 10.1159/000235945. PMID: 19729929.
[5] Bartossek, M. T., Kemmerer, J., & Schmidt, T. T. (2021). Altered states phenomena induced by visual flicker light stimulation. PLOS ONE, 16(7), e0253779. DOI: 10.1371/journal.pone.0253779. PMID: 34197510.
[6] Amaya, I. A., et al. (2023). Flicker light stimulation induces thalamocortical hyperconnectivity with LGN and higher-order thalamic nuclei. Imaging Neuroscience.
[7] Attokaren, M. K., Zhang, L., Mettupalli, S., & Singer, A. C. (2026). 40 Hz audiovisual stimulation improves sustained attention and related brain oscillations. Imaging Neuroscience, 4. DOI: 10.1162/IMAG.a.1229. PMID: 42146314.
[8] Cidral-Filho, F. J., Porter, P., & Donatello, N. N. (2025). An Integrative Review of Brainwave Entrainment Benefits for Human Health. Applied Psychophysiology and Biofeedback, 50(1), 3–9. DOI: 10.1007/s10484-024-09682-x. PMID: 39699823.
[9] Huang, T. L., & Charyton, C. (2008). A comprehensive review of the psychological effects of brainwave entrainment. Alternative Therapies in Health and Medicine, 14(5), 38–50. PMID: 18780583.
[10] Ecsy, K., Jones, A. K. P., & Brown, C. A. (2017). Alpha-range visual and auditory stimulation reduces the perception of pain. European Journal of Pain, 21(3), 562–572. DOI: 10.1002/ejp.960. PMID: 27807916.
Technology inspired by neuroscience, not a medical promise
The studies presented on this page concern various experimental protocols for visual or audiovisual stimulation, not specifically the LuminoMind device.
They help explain the neuroscientific mechanisms underlying rhythmic light stimulation, but do not demonstrate the clinical effectiveness of LuminoMind for diagnosing, preventing or treating a disease.