Fig. 3
From: Cerebral blood flow and arterial responses in migraine: history and future perspectives
Schematic drawing of events during and attack of MA. Initially rCBF decreases as the aura develops or even slightly before. After the aura has ended low flow continues into the headache phase. During that phase flow changes from low via normal to increased and it remains increased after the headache has disappeared. These changes and several other features ere totally incompatible with the vasospastic theory of migraine but in agreement with CSD as the underlying cause of the attack. Modified from [4]