Transcranial Stimulation for Physiotherapy Optimisation - Chronic Low Back Pain (STOP-CLBP)

Inclusion Criteria: * ability to give informed consent, * ability to follow protocol instructions, * diagnosis of Non Specific Chronic Low Back Pain ≥12 weeks, * low back pain with or without radiation to the knee, * average pain of the previous week ≥ 3 on the VAS (Visual Analogue Scale). * have sufficient cognitive ability to fill in the various questionnaires (Level B2 French), Exclusion Criteria: * herniectomy within the last 6 months, * lumbar spinal surgery with material (e.g. prosthesis, spondylodesis), * sensory or motor deficit of a lower limb, * radiant pain in the lower limb beyond the knee, * neuropathic pain (according to the dn4 questionnaire), * diagnosis of an inflammatory rheumatic disease (e.g. rheumatoid arthritis, spondyloarthropathy), * diagnosis of a chronic generalized pain syndromee of fibromyalgia, * pregnancy, * presence of neurological or neuropsychiatric disorders, * have epilepsy or a recent or severe head injury, * metal implant in the skull (excluding fillings), * presence of a pacemaker, * unhealed wound or skin disease on the skull (electrode contact area)