Usability of Cognitive Improvement Software in Cognitively Impaired Patients: Pilot Study

Inclusion Criteria: * Male and Female patients, 55\~85 years * Adequate vision, hearing and speaking for neuropsychological testing * No difficulty in using mobile application using smartphone * Patients with subjective memory complaints, confirmed by informants * Cognitive impairment of SD 1 or greater from the age-adjusted normal range in Memory domain in CERAD-NP battery * Global CDR 0.5 \~ 1 * Korean speaker * Have an identified trial partner * All subjects signed written consent Exclusion Criteria: * Those unable to provide consent * History of transient ischemic attack, stroke, brain tumor * History of diagnosis of major depression * Symptoms that may interfere with the subject's testing procedure * Cerebral hemorrhage * Central nervous system infections * Prohibited concomitant medication * Known or suspected history of drug or alcohol abuse