Figure 4. Characteristic non-linear relationship between arterial pressure and cerebral blood flow fluctuations at 0.03 Hz at baseline and after calcium channel blockade.

The dashed lines show the average across all subjects, and shaded regions denote 95% confidence intervals. The width of the striped bars on each plot denotes the range of autoregulatory region, and their height denotes average autoregulatory gain (±SEM). Higher autoregulatory gain indicates less efficient autoregulation. *P < 0.05.