Figure 5 - Results from the Rivermead Post Concussion Questionnaire RPQ-13 score for Study B – Case 3 and 4 - conducted at first intervention and after the intervention. RPQ-13 score includes symptoms of noise sensitivity, sleep disturbance, fatigue, irritability, depression, frustration, poor memory, difficulty concentrating, reduced cognitive function, blurry vision, light sensitivity, double vision and restlessness. Each symptom is scored from 0 to 4 – 0=not experienced at all, 1=no longer a problem, 2=a mild problem, 3=a moderate problem, 4=a severe problem. RPQ-13 range: 0-52