The left and right hemispheres of the brain are broadly responsible for different functions, and a Wada test is performed to map out memory and language function in the individual hemispheres. In a sense, Wada is an extension of the neuropsychological evaluation, and aims to determine whether the proposed surgery on the patient would result in significant memory deficits. This procedure also determines which hemisphere language function is fundamentally represented. Wada is invasive: each hemisphere is anesthetized in sequence using a short acting barbiturate through a catheter inserted in the femoral artery in the groin, and the ‘awake half’ of the brain is tested for language, memory, and learning function. With the advance of technology and availability of newer noninvasive methods, our use of Wada has decreased over the years.