Effect of Upper Extremity Rehabilitation Using Immersive Virtual Reality in Chronic Stroke Patients.

Inclusion Criteria: * Chronic stroke patients who have passed 6 months or more without additional stroke after the first stroke * Patients with upper extremity dysfunction due to stroke (ischemic, hemorrhagic) * Patients who can move the upper extremity against gravity with a manual muscle test of grade 3 or higher in the affected shoulder and elbow, respectively * Patients who can stably maintain a sitting position * Patients who voluntarily agreed to participate in the study Exclusion Criteria: * Patients with moderate or severe cognitive impairment with a score of 18 or less on the Mini-Mental Status Examination (K-MMSE) * Patients with other causes of upper extremity dysfunction, such as peripheral nerve damage, joint disease, etc. * Patients with a history of severe vertigo or epilepsy * Patients with medical reasons such as medical conditions that make it difficult to participate in research * Patients who may be pregnant or who are pregnant or lactating