There is evident alterations in brain function following mild traumatic brain injury (mTBI). It is of particular concern in the pediatric population with nearly 60% of children continuing to experience symptoms one month after injury. Currently, rehabilitation and return-to-life protocols use subjective self-measures of recovery. However recovery of symptoms may not coincide with recovery of brain function. There is evidence in changes in brain function during attention and memory tasks in youth following mTBI compared to controls. Furthermore, performance on tasks tends to suffer more during dual-task paradigms, where the brain is challenged to complete two tasks concurrently. This evidence comes from the use of functional magnetic resonance imaging (fMRI) which has given some insight into the underlying brain alterations following mTBI's. However, fMRI is expensive and is limited to positions where the patient is required to lie still. An inexpensive and accessible technique, functional near infrared spectroscopy (fNIRS), may be an alternate technique to measure brain function. This study will use fNIRS while completing a dual-task paradigm that combines an attention task (Stroop Interference Task) with the Clinical Test of Sensory Integration and Balance (postural sway). We believe that by monitoring brain function using fNIRS we will be able to better understand the underlying alterations caused by mTBI.