National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer's Disease and Related Disorders Association (NINCDS-ADRADA) criteria (Alzheimer's patient) OR Gordo-Tempini criteria (PPA's patient)
CDR score ≤ 2
treatment by IAChE ≥ 3 months
MADRS score \< 18
w/o severe progressive somatic pathology (especially tumor diseases)
You may not be if
last neuropsychological assessment \< 6 months
presence of a specific contraindication for tDCS (e.g. personal history of epilepsy, metallic head implant, cardiac pacemaker)