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Cerebral autoregulation in AD and MCI AD MCI 1 C 0.8 Phase rad 0.6 0.4 0.2 0 0 0.1 0.2 0.3 0.4 0.5 Frequency Hz Figure 3 Group average phase spectrum for AD (solid), MCI (dashed) and C (dash- dotted). Model description Estimation of the WKM parameters was successful in all recordings. Table 3 summarizes the three model parameters for the three groups. Peripheral resis- tance Rp was significantly increased in AD compared to C. MCI was in between AD and C without significant differences to either of them. Entering the WKM parameters from table 3 in equation 1, gain and phase can be calculated respec- tively as the modulus and argument of the transfer function H. Plots of gain and phase versus frequency are shown in figure 4 and 5 showing no significant differ- ence between groups. 69


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