Medical Definition of Wada test
: a procedure for identifying which hemisphere of the brain is dominant for language and memory function and that typically involves anesthetizing one hemisphere at a time (as by the injection of amobarbital into the internal carotid artery) and having the patient perform several cognitive tasks (such as identifying words or pictures or counting backwards) … a Wada test, is performed before neurosurgery to protect important brain processing centers from disturbance.— Jamie Talan, Newsday, 29 Jan. 2002
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