Characterization of Artifacts in the BIS™ EEG Signals in General Anesthesia Patients in Operating Room

Inclusion Criteria: * Men and Women * Age \>18 * Ability and willingness to participate in the study and sign informed consent form * Patients that will undergo elective surgery under general anesthesia. Exclusion Criteria: * Pregnant women * Disability or unwillingness to undergo EEG/EMG/ECG measurement * Subjects with known or suspected sensitivity to adhesive bandage * Subjects who have sustained CVA or severe head trauma in the last 10 years. * Subjects with known or suspected electroencephalograph abnormality (e.g. epilepsy or scarring) * soldiers * prisoners