Sheepdog Tip of the Day, During Combat tip 248
If the body is short of oxygen in the blood, one of the first locations that gets less is the eyes, and this directly affects the shooter's vision. The shortage of oxygen will also soon affect the brain (decision making) and fine-motor control (trigger finger).
Linda K. Miller and Keith Cunningham, Secrets of Mental Marksmanship
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Bullet Proof Mind for the Armed Citizen Seminar
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Additional Resources
For PTSD, Shepherd Resource Group.