Inclusion Criteria:  Ischemic or hemorrhagic stroke patients Stroke with CT or MRI diagnosis Chronic patients with more than 3 months of stroke onset Patients with vegetative status or minimal consciousness (Coma Recovery Scale -revised: CRS-R) Age: 19 to 90 years old A person who voluntarily consents to the clinical trial in writing by the principal or legal representative  Exclusion Criteria:  In case of contraindications, including allergies to cerebrolysin Patients with contraindications to PET Progressive or unstable stroke In case of accompanying serious neurogenic disease Major depressive disorder, schizophrenia, bipolar disorder, dementia, and other serious psychiatric diseases. History of alcohol or other drug addiction within 3 years of onset In case of accompanying serious liver, kidney, heart, or respiratory disease If you have the following medical abnormalities (Total serum bilirubin> 4 mg/dL, alkaline phosphatase> 250 U/L, SGOT/AST> 150 U/L, SGPT/ALT> 150 U/L, or creatinine) > 3.5 mg/dL) In case of having a medical disease that is less than 1 year old During pregnancy or lactation Participating in other therapeutic research