Inclusion Criteria of Patients with Non-specific Chronic Neck Pain  Ages ranges from 20-40 years old Work with the computer at least 25 hours per week Neck pain of idiopathic origin ≥ 6 months during the past year Minimum of 3/10 on the numerical rating scale (NRS) in past 7 days  No structural abnormalities which are confirmed by neck X-ray or negative results of all the following special tests  Exclude nerve root compression: Cervical distraction test and Spurling's test Exclude cervical radiculopathy: Valsalva test Exclude cervical instability: Alar ligament test and Sharp-Purser test Specific head movements or maintaining the fixed posture for a long time reproduced neck pain  Inclusion Criteria of Healthy Subjects in the control group  Ages ranges from 20-40 years old Work with the computer at least 25 hours per week No history of neck and/or shoulder pain sustained over one week in the past one year  Inclusion Criteria of Healthy subjects in the Pilot Study  Ages ranges from 20-40 years old No history of neck and/or shoulder pain sustained over one week in the past one year  Exclusion Criteria of Patients with Non-specific Chronic Neck Pain and All Healthy Subjects)  Any known pathology or impairment in the shoulder joint, which is the origin of neck pain Current episode of neck pain related to a traumatic event (e.g., whiplash injury) Have a history of cervical and/or shoulder pathology (e.g., fracture, dislocation, trauma, surgery of spinal or shoulder joint, inflammatory disease, frequent headache or dizziness) Brain injury and neurological impairment (e.g., radiculopathy, myelopathy or stroke) Systematic diseases (e.g., rheumatoid arthritis, ankylosing spondylitis), fibromyalgia, tumor Contraindications to the use of transcranial magnetic stimulation (TMS), assessed with a safety screening questionnaire, including pregnancy, history of seizure, epilepsy and syncope, having cochlear implant, having medal implant and taking anti-depressant medication Any kind of previous manual and/or movement therapy on upper extremity and neck during in recent 3 months