In the field of research into new methods, we attempted to determine the primary effect, i.e. neuroleptic effects following the intensity of reactions to stimulation in patients undergoing microsurgery of the ear, comparing in particular the quantities of analgesic necessary and used during general anesthetic to ensure both clinically visible protection and, above all, suppression of the effects of stimulation at the level of recordings of arterial and venous pressures. This permits, in our opinion, one to evaluate the dose necessary but also, determine whether or not a drug belongs to the category of neuroleptics which are interesting for the anesthetist.