Study of the ANI Validity on Evaluation of Nociception in State of Hypnosis

Healthy subjects should assess pain on a numerical scale (EN), during painful skin stimuli of variable intensity delivered by a CO2 laser used at the power of 0.3 W, known for its safety. ANI (Analgesia Nociception Index) will be raised simultaneously. This sequence will be made on subjects at rest and in a state of hypnosis using the technique of \"remembering a pleasant memory\" and the ideo-sensory technique of \"protective glove\". The average value of the ANI will be compared to the value of the EVN of pain intensity.