Sheepdog Tip of the Day, During Combat tip 63
Not seeing or hearing something because you are concentrating on something else is a psychological manifestation. "Tunnel vision" and "auditory exclusion" appear to involve both psychological "concentration" influences and powerful physiological effects caused by bio-mechanical changes to the eye and ear. We need much more research on this topic, but the dominant theory at this time is that these biomechanical changes to the sensory organs are a side effect of vasoconstriction and the other stress responses that were addressed earlier.
Lt. Col. Dave Grossman, On Combat
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For PTSD, Shepherd Resource Group.