title: Interictal brain activity differs in migraine with and without aura: resting state fMRI study.
abstract: BACKGROUND
  Migraine is one of the most severe primary headache disorders. The nature of the headache and the associated symptoms during the attack suggest underlying functional alterations in the brain. In this study, we examined amplitude, the resting state fMRI fluctuation in migraineurs with and without aura (MWA, MWoA respectively) and healthy controls.
  
  
  METHODS
  Resting state functional MRI images and T1 high-resolution images were acquired from all participants. For data analysis we compared the groups (MWA-Control, MWA-MWoA, MWoA-Control). The resting state networks were identified by MELODIC. The mean time courses of the networks were identified for each participant for all networks. The time-courses were decomposed into five frequency bands by discrete wavelet decomposition. The amplitude of the frequency-specific activity was compared between groups. Furthermore, the preprocessed resting state images were decomposed by wavelet analysis into five specific frequency bands voxel-wise. The voxel-wise amplitudes were compared between groups by non-parametric permutation test.
  
  
  RESULTS
  In the MWA-Control comparison the discrete wavelet decomposition found alterations in the lateral visual network. Higher activity was measured in the MWA group in the highest frequency band (0.16-0.08 Hz). In case of the MWA-MWoA comparison all networks showed higher activity in the 0.08-0.04 Hz frequency range in MWA, and the lateral visual network in in higher frequencies. In MWoA-Control comparison only the default mode network revealed decreased activity in MWoA group in the 0.08-0.04 Hz band. The voxel-wise frequency specific analysis of the amplitudes found higher amplitudes in MWA as compared to MWoA in the in fronto-parietal regions, anterior cingulate cortex and cerebellum.
  
  
  CONCLUSIONS
  The amplitude of the resting state fMRI activity fluctuation is higher in MWA than in MWoA. These results are in concordance with former studies, which found cortical hyperexcitability in MWA.
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.
authors.forename: Péter
authors.initials: P
authors.lastname: Faragó
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.|MTA-SZTE Neuroscience Research Group, Szeged, Hungary.
authors.forename: Bernadett
authors.initials: B
authors.lastname: Tuka
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.
authors.forename: Eszter
authors.initials: E
authors.lastname: Tóth
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.|International Clinical Research Center, St. Anne's University Hospital Brno, Brno, Czech Republic.
authors.forename: Nikoletta
authors.initials: N
authors.lastname: Szabó
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.
authors.forename: András
authors.initials: A
authors.lastname: Király
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.
authors.forename: Gergő
authors.initials: G
authors.lastname: Csete
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.
authors.forename: Délia
authors.initials: D
authors.lastname: Szok
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.
authors.forename: János
authors.initials: J
authors.lastname: Tajti
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.
authors.forename: Árpád
authors.initials: Á
authors.lastname: Párdutz
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary.|MTA-SZTE Neuroscience Research Group, Szeged, Hungary.
authors.forename: László
authors.initials: L
authors.lastname: Vécsei
authors.affiliation: Department of Neurology, Neuroimaging Research Group, Albert Szent-Györgyi, Clinical Center, University of Szeged, Semmelweis u. 6, H-6725, Szeged, Hungary. kincses.zsigmond.tamas@med.u-szeged.hu.|International Clinical Research Center, St. Anne's University Hospital Brno, Brno, Czech Republic. kincses.zsigmond.tamas@med.u-szeged.hu.
authors.forename: Zsigmond Tamás
authors.initials: ZT
authors.lastname: Kincses
mesh_terms: D000328:Adult; D001921:Brain / Q000000981:diagnostic imaging / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D020325:Migraine with Aura / Q000000981:diagnostic imaging / Q000503:physiopathology*; D020326:Migraine without Aura / Q000000981:diagnostic imaging / Q000503:physiopathology*
keywords: ALFF; Frequency analysis; MRI; Migraine; Migraine with aura