The purpose of this study is to evaluate the effect of 10 sessions of anodal transcranial
Direct Current Stimulation (tDCS - 1 mA) applied to left Cortex DorsoLateral PreFrontal
(CDLPF) of Alzheimer's or Primary Progressive Aphasia (PPA) patients compared to the
application of a placebo tDCS (sham procedure) on cognitive functions, which are evaluated at
short term (1 week post-treatment) and mild term (3 weeks post-treatment).
After unblinding, patients who received placebo treatment could be received active tDCS.