Gray matter nulled and vascular space occupancy dependent fMRI response to visual stimulation during hypoxic hypoxia

► Similar CBV-weighted signal changes found in normoxia and hypoxia by both GMN and VASO fMRI. ► Reduced T2* change to visual stimulation in hypoxia found by both GMN and VASO fMRI. ► Reduced active brain region in hypoxia found by both GMN and VASO fMRI. ► Partial voluming effects by CSF and white matter for GMN signal were analyzed.