Virtual Reality Based Cognitive Training Program in Mild Cognitive Impairment

Inclusion Criteria: 1. Aged 50-85 2. A memory complaint by a participant or caregiver 3. Objective memory decline as defined by a delayed recall score of verbal learning test or logical memory worse than 1.0 standard deviations (SD) below age and education-adjusted normative mean 4. MMSE score better than1.5 SD below age and education-adjusted normative means 5. Global Clinical Dementia Rating (CDR) scale of 0.5 and memory score of CDR 0.5 or 1 6. Preserved activities of daily living (ADL), as defined by Korean Instrumental Activities of Daily Living \< 0.4 7. Not demented 8. Hachinski Ischemic Score ≤ 4 9. Can read and write Korean 10. brain MRI or CT showing no other diseases capable of producing cognitive impairment 11. Having a reliable informant who could provide investigators with the requested information. 12. Provide written informed consent Exclusion Criteria: 1. Participated in another clinical trial within the past 4 weeks 2. Other serious or unstable medical disease such as acute or severe asthma, severe or unstable cardiovascular disease, active gastric ulcer, severe liver disease, or severe renal disease 3. A clinically significant laboratory abnormality, such as an abnormal thyroid function test, abnormal low levels of vitamin B12 or folate, and positive syphilis serology 4. A primary other neurodegenerative disorder 5. Major psychiatric illness such as major depressive disorders 6. Drug or alcohol addiction during the past 10 years 7. Severe loss of vision, hearing, or communicative disability 8. Malignancy within 5 years 9. Any conditions preventing cooperation as judged by the study physician