 Investigators will choose patients with typical neuropsychological profiles of AD. All patients will have previously been recruited to the Virtual Physiological Human: Dementia Research enabled by IT. VPH-DAREIT is recruiting 30-40 participants in each of the three following groups mild AD, MCI and normal controls and thus our participants will be drawn from this group and all will have pre-existing high-resolution 3D structural and volumetric assessment plus resting-state fMRI scans. This resting-state fMRI data will be analysed to examine the DMN, allowing us to directly compare measures of brain-connectivity between EEG and fMRI and contrast the discriminatory ability of the two methodologies. 