Identification of Graphic Markers of Neurocognitive Disorders (MG)

Inclusion Criteria: * = \> 50 years old For control group : * not have a diagnosis of minor or major neurocognitive disorder. For AD : * Have mild stage Alzheimer's disease: 1/ Be diagnosed according to ICD-10 criteria for the following conditions: Alzheimer's disease and 2/ Have an MMSE score between 20 and 27, corresponding to a major TNC of mild stage or have a diagnosis of minor TNC with an MMSE score between 25 and 30, the validity period of a previously done MMSE is 3 months. For PPA : * Have Primary Progressive Aphasia according to the Gorno-Tempini criteria (Gorno-Tempini et al., 2011) and have an MMSE score between 20 and 27, corresponding to major mild TNC or have a diagnosis of minor TNC with an MMSE score between 25 and 30, the validity period of a previously made MMSE is 3 months. Exclusion Criteria: * Presence of pathologies of the dominant upper limb(s) (left, right or ambidextrous lateralization) disabling such as osteoarthritis, finger amputation, etc. * History of stroke. * Illiterate person. * Participate in a concurrent experimental clinical study, to avoid interference with our study. * Not understand oral and written French. The speakers are French-speaking and the language task is performed in French.