Verbal language, which is controlled by the dominant hemisphere, is widely mapped in this way. If the patient’s performance in the task decreases during inactivation, then the region of the brain explored is considered eloquent for the task and is preserved. This technique aims to temporarily inactivate a discrete brain area using DES while the patient performs a task. ![]() Brain mapping by direct electrical stimulation (DES) during awake craniotomy is currently a standard procedure that reduces the risk of permanent neurological deficits and increases the extent of tumor resection and the success of epilepsy surgery.
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