The science

What the research does, and does not, establish

ThetaMask is built on brainwave-entrainment research, aimed at nervous-system recovery: bringing arousal down under load. We are deliberate about the line between what studies suggest and what they prove, because the people we work with read carefully and we would rather under-claim than oversell.

How entrainment works

Audiovisual entrainment uses rhythmic light and sound to encourage the brain's own electrical rhythms to fall into step with an external frequency. Research suggests that guiding activity toward slower theta and alpha rhythms may support relaxed, recovered states. ThetaMask pairs photic entrainment from the mask with audio from the companion app to approach these rhythms together.

01

Stress load and physiological arousal

Slower brain rhythms track with a calmer, less reactive state.

During relaxation the brain shifts toward slower rhythms. Studies of relaxation techniques find they reliably raise theta power against controls, consistent with reduced central-nervous-system arousal. In a randomised trial, audiovisual entrainment was associated with improvements in self-reported mood, including lower tension, fatigue, and anxious feeling. A pilot study in a high-stress population reported acute reductions in anxiety and perceived stress, comparable in size to those reported for multi-week mindfulness programs, though without a control group or direct comparison.

Jacobs & Friedman, 2004 · Johnson et al., 2024 · Cone et al., 2025

02

Attention and emotional regulation

Frontal theta is a well-studied signature of focused, regulated states.

EEG research consistently shows theta activity rising during meditative practice compared with quiet rest. Frontal-midline theta, one of the better-characterised patterns, is linked to sustained attention and emotional regulation, and coincides with lower heart-rate measures and a subjective sense of relief from mental strain. Entrainment toward these rhythms has been proposed as an accessible alternative to dedicated practice; some studies report comparable effects.

Lagopoulos et al., 2009 · Kubota et al., 2001 · Dobrakowski et al., 2020 · Johnson et al., 2024 · Tripathi et al., 2025

03

Rest as a recovery signal

Rest is the outcome slower rhythms have been tracked against most closely.

Theta activity marks the drift from wakefulness into sleep, which makes rest one of the more measurable places to look for an effect of slower rhythms. One study found slow-wave entrainment increased time spent in Stage 3 deep sleep, and an eight-week pilot in elite athletes reported better sleep quality and less morning grogginess. In a qualitative study, participants described the experience as relaxing and easy to use, with faster sleep onset and fewer nighttime disruptions. We read results like these as signals that arousal came down, not as the purpose of the instrument.

Diaz et al., 2016 · Jirakittayakorn & Wongsawat, 2018 · Abeln et al., 2014 · Halpin et al., 2023 · Bavafa et al., 2023

The evidence we're generating

The research above is the foundation we build on. The next step is evidence from the device itself. We run studies with ThetaMask, on our own and with research partners, and we publish results here as they complete.

Donders Institute, Radboud

Live now

Academic study underway, supervised by a Donders principal investigator.

TNO

Upcoming

Stress reduction for people working in high-pressure environments.

To follow the studies as results land, get in touch.

Light, delivered precisely

The mask emits light only. Addressable side-emitting LEDs sit behind an infinity-mirror optic, and programs run at configurable frequencies and lengths, so stimulation is tuned rather than fixed. Audio is delivered separately through your own headphones. There is no speaker in the mask.

Controller
nRF52 (MDBT50Q module)
Light
SK6812 addressable side-emitting LEDs
Optics
Infinity-mirror effect
Programs
Configurable frequencies and lengths

Where we draw the line

We hold a firm line between what the research suggests and what it proves, and we will not make definitive claims about ThetaMask until our own studies conclude. Entrainment is an active field, individual responses vary, and we make no medical claims. ThetaMask is a recovery-support tool, not a treatment.

Safety

Safety note: photic stimulation can affect people with photosensitive epilepsy. Anyone with a seizure history or photosensitivity should consult a clinician before use.

Twelve peer-reviewed references

Every claim above traces to published work. The full list is here so you can check it yourself.

  1. 01

    Abeln, V. et al. (2014). Brainwave entrainment for better sleep and post-sleep state of young elite soccer players: a pilot study.

    European Journal of Sport Science, 14(5), 393–402.

    doi:10.1080/17461391.2013.819384
  2. 02

    Bavafa, A., Foroughi, A., Jaberghaderi, N., & Khazaei, H. (2023). Investigating the efficacy of theta binaural beat on the absolute power of theta activity in primary insomniacs.

    Basic and Clinical Neuroscience, 14(3), 331–340.

    doi:10.32598/bcn.2021.2162.1
  3. 03

    Cone, A., Zuzick, S., Durinski, T., et al. (2025). Alpha and theta audiovisual interventions in a reflective chamber demonstrate acute effects on stress and burnout.

    Preprint, Research Square.

    doi:10.21203/rs.3.rs-7842751/v1
  4. 04

    Diaz, B. A., Hardstone, R., Mansvelder, H. D., Van Someren, E. J., & Linkenkaer-Hansen, K. (2016). Resting-state subjective experience and EEG biomarkers are associated with sleep-onset latency.

    Frontiers in Psychology, 7, 492.

    doi:10.3389/fpsyg.2016.00492
  5. 05

    Dobrakowski, P., Blaszkiewicz, M., & Skalski, S. (2020). Changes in the electrical activity of the brain in the alpha and theta bands during prayer and meditation.

    International Journal of Environmental Research and Public Health, 17(24), 9567.

    doi:10.3390/ijerph17249567
  6. 06

    Halpin, S. J., Tang, N. K. Y., Casson, A. J., Jones, A. K. P., O'Connor, R. J., & Sivan, M. (2023). User experiences of pre-sleep sensory alpha brainwave entrainment for people with chronic pain and sleep disturbance.

    Pain Management, 13(5), 259–270.

    doi:10.2217/pmt-2022-0083
  7. 07

    Jacobs, G. D., & Friedman, R. (2004). EEG spectral analysis of relaxation techniques.

    Applied Psychophysiology and Biofeedback, 29(4), 245–254.

    doi:10.1007/s10484-004-0385-2
  8. 08

    Jirakittayakorn, N., & Wongsawat, Y. (2018). A novel insight of effects of a 3-Hz binaural beat on sleep stages during sleep.

    Frontiers in Human Neuroscience, 12, 387.

    doi:10.3389/fnhum.2018.00387
  9. 09

    Johnson, M., Simonian, N., & Reggente, N. (2024). Lightening the mind with audiovisual stimulation as an accessible alternative to breath-focused meditation for mood and cognitive enhancement.

    Scientific Reports, 14, 25553.

    doi:10.1038/s41598-024-75943-8
  10. 10

    Kubota, Y., Sato, W., Toichi, M., Murai, T., Okada, T., Hayashi, A., & Sengoku, A. (2001). Frontal midline theta rhythm is correlated with cardiac autonomic activities during the performance of an attention-demanding meditation procedure.

    Cognitive Brain Research, 11(2), 281–287.

    doi:10.1016/s0926-6410(00)00086-0
  11. 11

    Lagopoulos, J., Xu, J., Rasmussen, I., Vik, A., Malhi, G. S., Eliassen, C. F., et al. (2009). Increased theta and alpha EEG activity during nondirective meditation.

    Journal of Alternative and Complementary Medicine, 15(11), 1187–1192.

    doi:10.1089/acm.2009.0113
  12. 12

    Tripathi, V., Bhaskar, L., Kharya, C., Bhatia, M., & Kochupillai, V. (2025). Unlocking deep relaxation: the power of rhythmic breathing on brain rhythms.

    npj Mental Health Research, 4(1), 39.

    doi:10.1038/s44184-025-00156-4