Patent ID: 6950698

Claim:
Method of positioning electrodes in an electrode array comprising at least five electrodes for central nervous system (CNS) monitoring from the forehead of a patient's head, the method comprising the steps of: positioning a first electrode above the eyebrows to sense a signal from the frontalis and at least one of the corrugator, procerus, and orbicularis muscles of the patient and to detect phasic and tonic activation of facial muscles expressing painful mimic responses; positioning a second electrode above the first electrode on the fronto-lateral area of the frontal lobe of the patient and on the same hemisphere as the first electrode; positioning a third electrode above the eyebrows to sense a signal from the frontalis and at least one of the corrugator, procerus and orbicularis muscles of the patient at the opposite hemisphere when compared to the first electrode and to detect phasic and tonic activation of facial muscles expressing painful mimic responses; positioning a fourth electrode above the third electrode on the fronto-lateral area of the frontal lobe of the patient and on the same hemisphere as the third electrode; and positioning a fifth electrode on the patient's skin; wherein the at least five electrodes are arranged to distinguish at least two electroencephalography, frontal electromyography and eye movement signals from each other and assess a level of patient sedation.