Gamma 40 Hz · Isochronic
An isochronic tone pulsing 40 times a second over light pink noise. No headphones needed.
40 Hz is a gamma rhythm being studied with light-and-sound devices. This session is not a treatment. Stop if you notice ringing in your ears.
How is it made?
- Isochronic · Carrier 200 Hz · Pulse 40 Hz (Gamma)
- Pink noise
Sound is generated on this device in real time; no files are downloaded from a server. There is a 8 s fade-in at the start and a 0 min fade-out at the end.
Evidence
D · Insufficient evidenceNo clinical support; only laboratory findings, anecdotes or a single small study.
40 Hz is a gamma rhythm studied with light-and-sound devices. This session is not a treatment.
Evidence level D: Insufficient evidence- What do we know?
- 40 Hz stimulation is studied in Alzheimer's research because of animal findings; human studies have used light, sound or both. A meta-analysis of 11 controlled studies found no significant change in cognitive function, and tinnitus was reported more often with stimulation. A review of 62 sound-only studies found that brain findings from animal models were not consistently replicated in humans; some studies reported positive changes in cognitive measures.
- What don't we know?
- The large sham-controlled HOPE study (673 participants) completed on 17 August 2026 (primary completion 22 June 2026); as of 3 October 2026 no results are posted or published. The effect of 40 Hz binaural beats heard through headphones on attention is also inconsistent: one study found none, a small one found better general attention. In the earlier OVERTURE trial (76 people, 6 months), the light-and-sound device did not separate from sham on the primary clinical measure; most authors work for the company that makes it.
A session's level is the weakest of its linked claims; it is never raised by a strong but unrelated claim.
Keep your device volume comfortable, preferably below 60%. You can also use your device's headphone-safety settings.