Improving Information Extraction From EEG on Cerebral Anesthetic Drug Effects

Inclusion Criteria: * Healthy volunteers aged 18 to 70 years * Concerning the cognitive function: Volunteers are considered to have sufficient cognitive reserve if they are able to read and comprehend the patient information form, if they can adequately answer the anamnestic questions during the screening process and if they are allowed to provide legitimate written informed consent * No selection will be made regarding ethnic background. * For this study no control group has been selected as EEG is compared between episodes rather than between individuals (each volunteer is his/her own control) Exclusion Criteria: Volunteer refusal * Volunteer \< 18 years and \>70 years * Pregnancy * Exclusion criteria are weight less than 70% or more than 130% of ideal body weight * Neurological disorder (epilepsy, the presence of a brain tumor, a history of brain surgery, hydrocephalic disorders, depression needing treatment with anti-depressive drugs, a history of brain trauma, a subarachnoidal bleeding, TIA or cerebral infarct, psychosis or dementia , schizophrenia, alcohol or drug abuse). * Diseases involving the cardiovascular system (hypertension, coronary artery disease, prior acute myocardial infarction, any valvular and/or myocardial disease involving decrease in ejection fraction, arrhythmias, which are either symptomatic or require continuous medication/pacemaker/automatic internal cardioverter defibrillator * Pulmonary Diseases * Gastric Diseases * Endocrinologic diseases * …