The Complex Regional Pain Syndrome (CRPS) is a Chronic Pain Condition. This is a Preliminary Study to Explore and Test Clinical Hypothesis. They Suppose That CRPS Patients Have Impairment in Their Mental or Motor Imagery Abilities.

Inclusion Criteria: * Patient with French healthcare affiliation * Adult patient (\> 18 years old) * Patient with bachelor degree minimum * Patient practicing less than 150 minutes of moderate to intense physical activity per week Specific Inclusion Criteria for CRPS group : * Patient followed in the Evaluation and Treatment pain center (University Hospital of Nimes) * Patient with secondary CRPS due to a traumatism or a surgery Specific Inclusion Criteria for Musculoskeletal group : * Patient with musculoskelettal disorder on a limb (upper or lower) * Patient followed in the University Hospital of Nimes Non inclusion Criteria : * Patient who participates in another category 1 research * Patient in a exclusion period in another study * Patient under legal protection, under guardianship or under curatorship * Patient for whom it is impossible to give clear information. * Pregnant, parturient or breastfeeding patient. * Patient with amputation on one of his limb * Patient with visual cecity * Patient who has already practiced mental imagery * Patient with neurological impairment * Patient with chronic low back pain and fibromyalgia Specific non inclusion criteria for Musculoskeletal group and healthy group : -Patient with CRPS Specific non inclusion Criteria for CRPS group : * Secondary CRPS to CVA (cerebrovascular accident) * Patient receiving lymph node block treatment between the inclusion visit and the follow-up visit Specific non inclusion Criteria for Musculoskeletal Disorder group : * Patient with secondary musculoskeletal disorder to a CVA Exclusion criteria : * Questionnaire MIQ-RS not completed or non respect with the research protocol * pathology discovered incompatible with the study criteria