C_S_D 1060 Lecture Notes - Lecture 5: Internal Carotid Artery, Commissurotomy, Wada Test
17 May 2016
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Document Summary
We have seen that lesions in specific areas of the left hemisphere (lh) result in language disorders. This suggests that some language functions are lateralized to the lh. The wada test consists of behavioral testing after the injection of an anesthetic into the right or left internal carotid artery. The goal is to establish which hemisphere controls different functions prior to brain surgery. Speech lateralization in patients without early brain damage to the left hemisphere. Speech lateralization in patients with early brain damage to the left hemisphere. Commisurotomy is a surgery that severs the corpus collosum (the fibers that connect the two brain hemispheres) to prevent the spread of electrical charges during seizures. The result is that the two hemispheres cannot pass information back and forth. In experiments, commissurotomy patients focus on a midpoint. A stimulus is presented to the left or right of midpoint for about 50 msec (too brief for subject to shift eyes)
