 EEG Data analyses The error reduction ratio-causality method will be used to calculate levels of synchronisation. The standard EEG 10-20 electrodes, including all possible contiguous electrode combinations in pairs of two e.g. right frontocentral versus parietoccipital will be used in our pilot exploration to assess the 95 confidence interval levels of synchronisation and determine if they allow robust separation between healthy volunteers and patients with Alzheimers Disease. 