title: Cerebral hemodynamic reactivity measured by near-infrared spectroscopy in migraineurs.
abstract: Brain hemodynamic responses (BHR) of healthy subjects and migraineurs performing a breath holding task are measured by functional near-infrared spectroscopy (fNIRS) method. The response curves are deconvolved from a rectangular input function to yield the impulse response (IR) function of BHR which was then modeled by a summation of three gaussians. Our results show that the amplitude coef&#163;cients estimated from IR of BHRs are approximately 350% and the dispersion coef&#163;cients 145% higher for healthy subjects. These results con&#163;rm the &#163;ndings of several other researchers where a decrease in cerebral blood &#164;ow has been shown for migraineurs during breath holding tasks.
authors.affiliation: Institute of Biomedical Engineering, Bogazici University, Bebek, Istanbul, 34342 Istanbul ata.akin@boun.edu.tr.
authors.forename: Ata
authors.initials: A
authors.lastname: Akin
authors.forename: Uzay
authors.initials: U
authors.lastname: Emir
authors.forename: Hayrunnisa
authors.initials: H
authors.lastname: Bolay