> As the scotoma’s shining edges recede across your field of vision, they trace a corresponding wave of electrical activity, a “spreading depression” crossing t

> As the scotoma’s shining edges recede across your field of vision, they trace a corresponding wave of electrical activity, a “spreading depression” crossing the cortex at 3 millimeters per minute. I didn't realize the way scotomas grow mirrors the cortical spreading depression in your brain, but it makes sense! Explains why the scotoma doesn't really "vanish," it just gets bigger until expands past your field of vision. I also wonder whether this proves that the scotomas I've had in dreams were real migraine auras and not just... dream artefacts or whatever.