No drug and no placebo will be used in this study. The study participants will only rate their pain on a numerical scale (EN) following cutaneous painful stimulation (6 for each phase) of variable intensity, delivered by a CO2 laser. ANI (Analgesia Nociception Index) will be raised simultaneously by the ANI monitor. This sequence will be performed on subjects at rest and in a state of hypnosis by the technique of "remembering a pleasant memory" and the ideo-sensory technique of "protective glove".

Painful skin stimuli of variable intensity will be delivered by a CO2 laser used at the power of 0.3 W for each stimulation (6/phases) and this for each of the 3 phases (critical consciousness or hypnosis). During each stimulation, ANI values will be identified by the Physiodoloris ® monitor, through 3 standard ECG electrodes placed on the thorax of the subject.

ANI value (0 to 100, without unit of measure) recorded continuously for 60 seconds after the painful stimulation compared to the EVN value of the pain intensity, from zero to ten (numerical verval scale), and this for each of 6 painful stimuli intensities of each three consecutive phases of the study.

EVN value of the arduousness of pain perception, from zéro to ten, for a stimulation intensity, depending on the phase of the study, compared to the ANI.