40 Hz Visual Stimulation During Sleep Evokes Neuronal Gamma Activity in NREM and REM Stages

Study objectives: Visual stimulation at 40 Hz is being tested as a non-invasive approach against dementias such as Alzheimer's disease. Applying it during sleep could increase convenience, duration, and efficacy of stimulation. Here, we tested the feasibility of 40 Hz visual stimulation during sleep in a proof-of-concept study.

Methods: 30 healthy participants underwent one control and one experimental night of polysomnography at the sleep laboratory. 40 Hz visual stimulation was delivered in wakefulness (W), NREM sleep stages 2 and 3, and REM sleep.

Results: As expected, 40 Hz EEG spectral power was increased in all four stages in the experimental condition, compared to control. It was highest in W and similar across NREM 2, NREM 3, and REM, with large and medium effect sizes, respectively. Steady-State Visually Evoked Potential (SSVEP) analyses in the time domain confirmed the specificity of the effect. Secondary analyses revealed that the intervention did not impair objective and subjective sleep quality beyond the first night effect.

Conclusion: 40 Hz visual stimulation during sleep effectively evoked neuronal gamma activity at stimulation frequency without degrading sleep quality, supporting the feasibility of this approach. These findings lay the groundwork for optimizing gamma-band sensory stimulation as a tool to causally study cognitive functions and as a scalable, non-invasive intervention against dementias.