A Frequency-Modulated Music Intervention to Enhance Cognitive Processing Therapy (CPT) for PTSD

Inclusion Criteria: * At least 18 years of age * Meets diagnostic criteria for a) PTSD or b) subthreshold PTSD with hyperarousal (i.e., meets diagnostic threshold for 3 of 4 symptoms, one of which is hyperarousal) * Ability to move between sitting to standing without assistance * Ability to attend two weeks of daily in-person therapy sessions at either the Ohio State University or at the Wright-Patterson Air Force Base (WPAFB) Medical Center Exclusion Criteria: * Heart condition (such as cardiac arrhythmia) or pacemaker * An allergy that would prevent wearing adhesive for durations of 2 hours or less * Insufficient English fluency to fully engage in psychotherapy * Use of hearing aids * Current or prior tinnitus (persistent ringing or other noises in ears not caused by an external sound) * Severe traumatic brain injury * An ongoing stressor or condition deemed by the investigators to place the participant at risk for injury or a poor outcome (e.g., undergoing disability evaluation, undergoing a medical board evaluation to be medically discharged from the military, pending negative administrative or legal actions). * Inability to complete the informed consent process due to the acute effects of a medical or psychiatric condition (e.g., intoxication, mania, psychosis)