Specific Aims: 1). Evaluate the clinical utility of psychophysiologic reactivity measures to predict overall PTSD symptom response among OEF/OIF/OND (Operation Enduring Freedom/Operation Iraqi Freedom/Operation New Dawn) veterans receiving treatment for PTSD. 2). Evaluate the clinical utility of psychophysiologic reactivity measures to predict psychosocial functioning and health-related quality of life (HRQoL) response among OEF/OIF/OND veterans in treatment for PTSD. Exploratory). Develop psychophysiologic, neuropsychological, and/or self-report models to predict PTSD symptom response to pharmacotherapy, psychotherapy, and combined pharmacotherapy/psychotherapy. The investigators will divide psychophysiologic reactivity predictors into two groups: heart rate variability and attentional bias (eye gaze tracking and modified Stroop). The investigators will collect observational and longitudinal data from a treatment-seeking sample of 50 OEF/OIF/OND veterans with PTSD recruited from the Central Arkansas Veterans Healthcare System (CAVHS) Mental Health Clinics.