Application of Transcranial Direct Current Stimulation (tDCS) in Patients With Chronic Pain After Spinal Cord Injury

STUDY ELIGIBILITY CRITERIA (similar to the criteria of the Interstitial Cystitis Network) 1. Providing informed consent to participate in the study 2. 18 to 64 years old 3. with traumatic spinal cord injury (complete or incomplete) - for instance, due to fall, car accident or gun shot; (for spinal cord injury only) 4. stable chronic pain for at least the three preceding months(for spinal cord injury only) 5. score higher or equal to 4cm (0 cm= 'no pain' and 10cm='worst possible pain') on the Visual Analogue Scale (VAS) for pain perception at the baseline/start of the treatment(for spinal cord injury only) 6. refractoriness to drugs for pain relieve - such as tricyclic antidepressants, antiepileptic drugs and/or narcotics (pain resistant to at least 2 of these drugs supplied in adequate dosages for six months) (for spinal cord injury only) 7. pain is not attributable to other causes, such as peripheral inflammation. 8. No clinically significant or unstable medical or psychiatric disorder 9. No history of substance abuse 10. No neuropsychiatric comorbidity 11. No implanted devices for pain control, such as vagal or deep brain stimulators 12. No contraindications to tDCS: * metal in the head * implanted brain medical devices 13. No pregnancy 14. Eligible to MRI according to MRI screening checklist. 15. No use of ventilators