Neurovegetative Decoupling in Somatoform Disorders : Biofeedback Interest

Inclusion Criteria: * Somatoform disorders (IBS or PNES) diagnosis must be established by the partner doctors * Participants must have home computer * Participants must be of the age of majority * Participants must be registered for social security * Participants must have signed an informed consent Exclusion Criteria: * Specially protected participants (under clauses L1121-5 and L1121-8 by the code of public health): juveniles, pregnant womens, nursing mothers, law's protection peoples * Participants suffering from a severe psychiatric disease needing specialised attention * Participants suffering from or have suffered from a severe disease causing autonomic dysfunctions (heart failure, asthma, blood disease, renal failure, peripheral neuropathy, vagotomy, thyroid disorder, alcoholism, liver disease, amyloidosis) * Participants taking medication which could be impact autonomic nervous system activity (anticholinergic, antiarrhythmics, clonidine, beta-blockers, tricyclic anti-depressants, metronidazole) * Participants placing under judicial or administrative supervisions * Participants were compensated more than 4500 euros because of his research protocol participation concerning human over the 12 months prior to the actual study * Participants being not be able to contact in emergency * Participants being in an exclusion period from another study