Inclusion Criteria:  13-21 years Has sustained an external force to head or body resulting in neurological symptoms and at least one reported symptom is attributed to the mTBI (e.g., dizziness, confusion, headache, postural instability, light/noise sensitivity, nausea) Has receive a medical diagnosis of mTBI from an emergency physical at the IFH Pediatrics ED within 72 hours of injury Is able to provide informed written consent (parent) and assent  Exclusion Criteria:  Loss of consciousness > 30 minutes in conjunction with the injury Glasgow Coma Scale (GCS) score < 13 Has sustained a previous mTBI within the past 6 months Has a neurological disorder (e.g., epilepsy) Has a positive finding on brain imaging (e.g., CT, MRI) that suggests a severe closed head or open injury involving any structural damage or abnormality (e.g., fracture, subdural hematoma) Has a previous history of neurosurgery Does not speak English as a primary language Requires admission to the hospital Has developmental delays Prisoner Pregnant* Has been previously enrolled in the study