What is the Wada test used to assess?

• A. A test in which one hemisphere is anesthetized to test capacity and speed of processing of the other
• B. An imaging procedure used to visualize brain activity
• C. A cognitive assessment battery for memory and learning
• D. A test to measure reaction time and motor speed

Answer: (A)

The Wada test is about mapping what each hemisphere can do by temporarily inactivating one side of the brain to see what the other side can still handle. By injecting a short-acting anesthetic into a carotid artery, clinicians render one hemisphere temporarily nonfunctional and then assess language and memory performance with the opposite hemisphere. This helps determine which hemisphere is dominant for language and how memory functions are distributed, a crucial step before brain surgery to avoid damaging essential areas. It isn’t an imaging procedure that visualizes brain activity, nor a broad cognitive battery or a simple motor-speed test.