MNI coordinates of brain regions that showed increased BOLD fMRI signal intensity during the sympathetic vasoconstrictor response elicited by the apneas.

The x- (right/left), y- (anterior/posterior), and z- (superior/inferior) values represent the MNI coordinates (in millimeters from the anterior commissure) for the voxel with the greatest statistical value (Z-Score) within each cluster.
Definition of Abbreviations: BOLD  =  blood oxygen level-dependent; fMRI  =  functional magnetic resonance imaging; MNI  =  Montreal Neurological Institute.