This is a pilot study of 55 adult male veterans with PTSD. The study will test a new mobile application "app" that can be run on an iPhone10. The app, which is called the Mobile Acoustic startle Reflex-monitoring System (a.k.a., MARS), will be used to measure participant's acoustic startle in sitting or standing postures.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Acoustic Startle Response (speed)
Timeframe: 1 year after initiation of enrollment