Theory 35/Migraine cycle/Progression phase
Aura Is a Spread Rate
The claim
The aura duration is set by the ratio of cortical spreading depression velocity to the extent of cortex involved, so aura length maps to spread.
01Mechanism
The wave travels at a fixed velocity; duration follows from distance.
02Prediction
Aura duration should track the ratio.
03Refutation
Duration tracking wave amplitude would remove velocity.