"A new study reveals how flickering lights can trigger hallucinations by causing standing waves in the brain’s visual cortex. Researchers observed that high-frequency flickering lights create ripple-like waves of neural activity, which turn into standing waves at higher frequencies.
These standing waves might explain the geometric patterns people often perceive during flicker-induced hallucinations. While the exact mechanism is still under study, this research offers the first strong evidence for how brain waves contribute to visual hallucinations."
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https://neurosciencenews.com/light-visual-hallucinations-27642/