Frequency-specific photobiomodulation at theta and gamma enhances cognitive networks and mitigates age-related decline

What the authors concluded

Both 5 Hz and 40 Hz stimulation improved cognitive performance in young adults, although 40 Hz induced more pronounced and immediate effects, particularly enhancing prefrontal activation and modulating prefrontal c-Fos expression. These behavioral gains were accompanied by frequency-dependent regulation of neuroinflammatory pathways—including differential modulation of IL-6, IL-10, and NF-κB—as w

Devices that emit this wavelength

Matched on wavelength within 15nm, since LED bins vary by roughly that much and a tighter match would be false precision. Where we have an irradiance figure, the session length is the time needed to reach this study's dose of 33 J/cm² at that intensity.

Matching a wavelength is not the same as reproducing a trial. Session times assume the device's published irradiance is accurate at the distance it was measured, which on brand-claim figures is often optimistic. Where a device publishes both a peak and an average we use the average, and where it publishes a falloff curve we use the lowest figure, so these times run long rather than short. Clinical protocols also control for spot size, contact and skin type in ways a home device cannot.