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Closed-Loop Acoustic Stimulation of Slow Oscillations Using a Wireless EEG Headband: A Polysomnography-Validated Feasibility Study.

Jongejan S, van der Heijden A, Talamini L • Sensors (Basel, Switzerland) • 2026

PubMed 42944391 DOI 10.3390/s26206528
TL;DR

These results demonstrate the feasibility of closed-loop acoustic stimulation using a wireless EEG headband, providing a foundation for future home-based and clinical applications.

Key Findings

Results

A real-time modeling approach to closed-loop acoustic stimulation (M-CLNS) can be implemented on a wireless EEG headband with forehead electrodes in healthy participants.

  • Acoustic stimulation was delivered during a single night of sleep in alternating stimulation and sham conditions.
  • Results were validated against simultaneous polysomnography (PSG) as an independent reference.
  • The study was framed as a feasibility study.
Results

Slow oscillation (SO) phase was targeted consistently near the intended phase using the headband.

  • This held despite reduced amplitude and signal quality in the headband compared with simultaneous PSG.
  • Phase-targeting accuracy was evaluated using the headband signal and compared with PSG.
Results

Acoustic stimulation produced an immediate enhancement of SO dynamics.

  • The immediate enhancement was apparent in both the EEG headband and the PSG signals.
  • Effects were assessed by comparing stimulation and sham conditions.
Results

Acoustic stimulation produced sustained increases in SO density and in power spectral density within the SO and delta range (0.75-5 Hz) during deep sleep.

  • The sustained effects were apparent in both the headband and PSG signals.
  • The frequency range analyzed was 0.75-5 Hz.
Conclusions

The headband signal had reduced amplitude and signal quality relative to simultaneous PSG, yet could still detect stimulation-induced changes in oscillatory dynamics.

  • Forehead electrodes were used in the headband.
  • Stimulation effects were detectable in both the headband and PSG recordings.

What This Means

This study tested whether a wireless EEG headband worn on the forehead could be used to time sounds to the brain's deep-sleep waves, an approach that until now has mostly needed lab equipment with many electrodes. Healthy participants slept one night wearing the headband along with standard sleep-lab recordings (polysomnography). Sounds were played in alternating stimulation and sham (no sound) periods. The headband's signal was weaker and noisier than the lab recording. Even so, the system delivered sounds consistently near the intended phase of the slow oscillation. The stimulation produced an immediate boost in slow-wave activity. It also produced longer-lasting increases in slow oscillation density and in delta-range power (0.75-5 Hz) during deep sleep. These effects appeared in both the headband and the lab recordings. This research suggests that sleep-enhancing acoustic stimulation could be done with wearable devices outside the lab. The study was a single-night feasibility test in healthy people, so it does not show effects on sleep quality or health outcomes. It provides a basis for future home-based and clinical work.

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Citation

Jongejan S, van der Heijden A, Talamini L. (2026). Closed-Loop Acoustic Stimulation of Slow Oscillations Using a Wireless EEG Headband: A Polysomnography-Validated Feasibility Study.. Sensors (Basel, Switzerland). https://doi.org/10.3390/s26206528