BOLD-contrast functional MRI signal changes related to intermittent rhythmic delta activity in EEG during voluntary hyperventilation - simultaneous EEG and fMRI study. - Minna Mäkiranta; Jyrki Ruohonen; Kalervo Suominen; Eila Sonkajarvi; Timo Salomäki; Vesa Kiviniemi; Tapio Seppänen; Seppo Alahuhta; Ville Jäntti; Osmo Tervonen (NeuroImage, 2004)