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Z‐stat maps of hypercapnia‐induced blood oxygenation level‐dependent (BOLD) (a) and vascular space occupancy (VASO) (b) signal changes and calculation of the calibration parameter M (c). Error bars refer to the SE of the mean. An region of interest (ROI) encompassing the hand‐knob area of the left hemisphere with significant BOLD (Z > 2.3; p < .01) and VASO signal changes (Z > 1.8; p < .05) was chosen for the calculation of M using Equation (4)
