The Loss of Multifractality in Migraines
  We study the middle cerebral artery blood flow velocity (MCAfv) in humans using transcranial Doppler ultrasonography (TCD). The time series of the axial flow velocity averaged over a cardiac beat interval is found to exhibit clear multifractal properties for healthy subjects. We observe a loss of multifractality for subjects with migraine. 
Miroslaw Latka, Marta Glaubic-Latka, Dariusz Latka, Bruce J. West