Inclusion Criteria:  General Inclusion Criteria (must be met for both AD and MCI group):  right-handed normal or corrected to normal vision through lenses meet inclusion criteria related to TMS Be able to provide information regarding their cognitive and functional skills, or have a caregiver available who is able to provide the patient information necessary for participation in the study and who is present when signing the patient's informed consent.  AD Patient Inclusion Criteria:  Mini Mental State Examination (MMSE) score ≥ 16; Stable intake of cholinesterase inhibitors for at least 3 months before the start of the protocol  MCI Patient Inclusion Criteria:  Diagnosis of mild cognitive impairment Mini Mental State Examination (MMSE) score ≥ 24;  Patients will be selected through clinical evaluation (battery of neuropsychological tests at the Neurocognitive Rehabilitation Center (CeRiN) and, in accordance with the APSS, a CSF and PET examination will be performed as well as a further finalized neuropsychological evaluation for research.  Exclusion Criteria:  Patients who are unable to perform the tasks required by the experimental procedure; History and / or evidence of any other central nervous system disorder that could be interpreted as a cause of dementia such as structural or developmental abnormality, epilepsy, infectious disease, degenerative or inflammatory/demyelinating diseases of the central nervous system such as Parkinson's disease or Fronto-temporal dementia History of significant psychiatric disease which, in the investigator's judgment, could interfere with study participation History of alcohol or other substance abuse, according to DSM-V criteria, or recent or previous history of drug abuse if this could be a contributing factor to dementia Ongoing treatments with drugs that contain / intake of the following substances: imipramine, amitriptyline, doxepin, nortriptyline, maprotiline, chlorpromazine, clozapine, foscarnet, ganciclovir, ritonavir, amphetamines, cocaine, (MDMA, ecstasy), phencyclidine (PCP, angel dust), gamma-hydroxybutyrate acid (GHB), theophylline Presence of cardiac pacemakers, electronic prostheses, bio-stimulators, metal inserts or electrodes implanted in the brain or skull or spine.  Absolute exclusion criteria (Criteria for TMS), which in detail are:  presence of cardiac pace-makers, artificial heart valves and / or bio-stimulators presence of hearing aids located in the middle ear; presence of metal inserts on the head and shoulders;