#teichopsia

Hubert Airy’s drawing illustrates how his migraine aura grew

There’s still much we don’t know about migraines and migraine auras. One hypothesis is that a sort of electrical wave sweeps across the visual cortex, causing hallucinations that spread across the corresponding parts of the visual field. In a loosely descriptive way, Airy’s time series drawings—showing an ever expanding shape—jibe with this too.