 The first objective of this thesis is to investigate the hypothesis that prerecorded autosuggestion PA can be a theoretically valuable efficacy and practical efficiency tool in the care of many patients with chronic pain. With a prevalence in chronic pain conditions of - 20 of adults, chronic pain is a huge problem for individuals as well as for society, absorbing an enormous amount of resources. Even with all available treatments, many people still suffer from chronic pain, in particular when this pain has a psychosomatic functional origin. In the PALPI study Prerecorded Autosuggestion in Long-standing Pain Intervention, accompanying this thesis, efforts are made to mainly involve chronic pain of clearly psychosomatic origin. 