Which condition is characterized by a lack of blood supply to the brain?

The condition characterized by a lack of blood supply to the brain is a cerebrovascular accident, commonly known as a stroke. This occurs when blood flow to a part of the brain is interrupted or significantly reduced, preventing brain tissue from getting the oxygen and nutrients it needs. When this blood supply is cut off, brain cells can begin to die within minutes, leading to various neurological deficits depending on the area of the brain affected.

Cerebral palsy is a group of disorders that affect movement and posture and is typically caused by abnormal brain development or damage to the brain early in life. It is not primarily related to an acute lack of blood flow.

Parkinson's disease is a progressive neurological disorder that affects movement due to a loss of dopamine-producing brain cells. While it involves brain function, it is not directly linked to acute blood supply issues.

Migraine headaches are severe headaches often accompanied by other symptoms, but they are not caused by a lack of blood flow to the brain. Migraine attacks may involve changes in blood flow, but they do not correspond to the acute lack of blood supply seen in a cerebrovascular accident.

Thus, cerebrovascular accident accurately describes a condition directly resulting from a lack of blood supply to the brain.