Comparison of the impact of two NEurofeedback EEG protocols on the perception and threshold of experimental pain in healthy subjects

INTERVENTION: 1‐ Neurofeedback + schultz relaxation group : this group will undergo a n autogenic relaxation before the neurofeedback training that aims to increase alpha amplitude over C4. 2‐ Neurofeedback + Motor imagery training group: this group will undergo a Motor imagery training in which he will visualize his hand moving and then undergo a neurofeedback training to decrease the alpha amplitude over C4. 3 ‐Two groups Neurofeedback alone: one group will do a neurofeedback training with the target of increasing alpha amplitude and the second group will do a neurofeedback training that will decrease the alpha amplitude. 4‐ Scham group : this group will not do a neurofeedback training to modify his brainwave instead random values will be displayed during training a cognitive practice that involves mentally rehearsing and visualizing specific motor movements to enhance physical performance and improve motor skills. a methode of voluntarily brain modulatioin activity for therapeutic purposes a technique that involves deep breathing and progressive muscle relaxation to induce a state of calm and reduce stress and anxiety. electrical stimuli on the skin for inducing pain Motor Imagery neurofeedback putting the hand in cold water for inducing pain Schultz Relaxation TENS CONDITION: neuropathic pain results from damage or disease of the somatosensory nervous system, which affects the central and/or peripheral nervous system . This pain directly interferes with the well‐being of sufferers. Indeed, it significantly reduces the quality of life, causes emotional distress and negatively affects the sleep cycle in the affected population, in comparison with the general population and even sufferers of non‐neuropathic chronic pain. Consequently, a lack of adaptation to the level of daily life is noted (absences at work, social withdrawal, etc.) . Therefore, appropriate treatment is essential to improve their lives. ; pain pain T51.2 PRIMARY OUTCOME: Name: increase of pain tolerance with CPT after treatment;Timepoints: before and after each session. And the start and end of experiment. Measure 2: maximum time of hand submersion.;Measure: maximum time of hand submersion Name: Reduction of pain perception with TENS after treatment.;Timepoints: before and after each session. And the start and end of experiment.;Measure: pain perception using Verbal Rating scale SECONDARY OUTCOME: Name: efficacity of Motor imagery to decrease alpha amplitude during training;Timepoints: before and after each session. And the start and end of experiment.;Measure: mean alpha wave amplitude using an eeg Name: efficacity of schultz relaxation to increase alpha amplitude during training.;Timepoints: before and after each session. And the start and end of experiment;Measure: mean alpha wave amplitude using an eeg INCLUSION CRITERIA: ‐ The inclusion criteria are: ‐Young and healthy subject, aged between 18 and 30 years old ‐Male and female se X ‐Right handed ‐ Absence of urticaria reactions to cold ‐No analgesics 6 hours before visits/tests ‐Regular sleep cycle (Bergen insomnia scale Ar‐Fr) ‐ Perceived stress within the norms(PSS10 Ar‐Fr)