Effects of Transcranial Temporal Interference Stimulation on Cognitive Function in Mild Cognitive Impairment

Inclusion Criteria: * Age 60-80 years * Community-dwelling * Montreal Cognitive Assessment (MoCA) score \< 26 * Clinical Dementia Rating (CDR) score = 0.5 * Activities of Daily Living (ADL) score \< 26 (largely intact daily function) * Does not meet criteria for dementia diagnosis (based on DSM-5 or NIA-AA criteria) * No contraindications for MRI examination (no metallic implants, no claustrophobia) * Able to provide written informed consent Exclusion Criteria: * Neurological conditions that may cause cognitive decline (e.g., cerebrovascular disease, encephalitis, Parkinson's disease, Huntington's disease) * Severe visual, auditory, or language impairments preventing completion of neuropsychological assessments * Severe depression (Geriatric Depression Scale \> 10) or other major psychiatric disorders * History of seizures or epilepsy * Previous deep brain stimulation or electroconvulsive therapy within 6 months * Alcohol or substance dependence * Concurrent participation in another interventional clinical trial * Contraindications for non-invasive brain stimulation: electronic or ferromagnetic implants, non-MRI compatible metal implants, history of seizures, pregnancy