Fig. 2

a The phase difference and gain derived from the transfer function within significant interval 0.06-0.12 Hz are plotted. (−: left middle cerebral artery [MCA] and ---: right MCA). Phase difference values (parameter of dynamic cerebral autoregulation) were significant compromised in patients with generalized anxiety disorder (GAD) compared with the healthy group, indicating an impairment of dynamic cerebral autoregulation in patients with GAD. There was no difference of the gain values between GAD group and healthy group. b Statistical analysis of phase differences and gains are shown. Phase difference values in the GAD group were significantly lower than the corresponding MCA of the healthy group. There was no difference in gain values in the two groups