Fig. (5) Parametric maps from one brain slice in the monkey experiment. The upper row shows maps from the baseline experiments (from the left: CBF, K₁, K_acc), and the lower row shows the corresponding maps after increased Pa_CO2. For CBF the colour scale goes from 0.02 to 0.7 ml g^-1 min^-1, for K₁ the scale goes from 0.04 to 0.7 min^-1, and for K_acc the scale goes from 0.01 to 0.07 min^-1.