Federica Agosta1, Michela Pievani1,2, Cristina Geroldi2, Giovanni B. Frisoni2, Massimo Filippi1
1Neuroimaging Research Unit, Institute of Experimental Neurology, Division of Neuroscience, Scientific Institute & University Hospital San Raffaele, Milan, Italy; 2IRCCS Centro San Giovanni di Dio - Fatebenefratelli, Brescia, Italy
Using resting-state (RS) fMRI, the coactivation patterns of the default mode network (DMN) and frontal networks were explored in Alzheimers disease (AD) and amnestic mild cognitive impairment (aMCI) patients. AD was associated with opposing coactivation effects in the DMN (decreased) and frontal networks (enhanced). The only RS abnormality in aMCI patients was a precuneus coactivation reduction in the DMN. The limited resources of the parieto-temporal cortex of AD patients may be paralleled, in an attempt to maintain cognitive efficiency, by an increased prefrontal coactivation. A medial parietal RS fMRI change seems to be present since the early phase of AD.