Effect of Donepezil on the Reorganization of Cognitive Neural Network in Patients With Post-Stroke Cognitive Impairment

Inclusion Criteria: * Ischemic stroke in the territory of right or left middle cerebral artery * Post-onset duration of the recent-onset stroke is over 3 months * Cognitive deficit ranged from 10 to 26 by minimal mental status examination (MMSE) score * Disturbance in activities of daily living (ADL) ranged 0.5 \~ 2.0 by clinical dementia rating (CDR) scale Exclusion Criteria: * Severe internal carotid artery stenosis on the lesion side * Cardiac pacemaker or intracranial metal insertion * Post-stroke seizure disorder or any evidence of epileptic spikes on electroencephalography (EEG)