40 Hz Black/White Flicker

⚠️ Important Safety Warning – Photosensitivity & Seizure Risk

This 40 Hz visual flicker feature may trigger seizures or other adverse reactions in people with photosensitive epilepsy, undiagnosed photosensitivity, migraines, or certain neurological conditions.

Although 40 Hz is generally outside the most common trigger range (5–30 Hz), no flashing light stimulation is 100% safe for everyone. Individual sensitivity varies.

Do NOT use this feature if you:

Have ever had a seizure or been diagnosed with epilepsy or photosensitive epilepsy
Have a family history of seizures or photosensitive epilepsy
Experience discomfort, headaches, or visual issues from flashing lights or patterns
Have any neurological condition or migraines

Before using: Consult your physician. This feature is for entertainment and educational purposes only. It is not a medical treatment or device and has not been evaluated by the FDA.

I have read and understand the seizure warning. I confirm I do not have epilepsy, photosensitivity, or any condition that could be triggered by flashing lights. I voluntarily assume all risks and agree to the Terms and Conditions.

This page demonstrates a simple 40 Hz black/white visual flicker pattern, inspired by published MIT and other laboratory research on gamma entrainment using sensory stimuli (often called GENUS). That research explored 40 Hz stimulation in animal models and early experimental human studies.

This demonstration is provided strictly for entertainment and educational purposes only. It is not a medical device, therapy, or treatment. It has not been evaluated or approved by the FDA. There is no guarantee of any health benefit, and results observed in research settings may not apply to this simple implementation or to humans in general.

Frequency: ~40 Hz (may vary by device)

If you experience dizziness, nausea, headache, or any unusual symptoms, stop immediately and seek medical attention.