I was talking to someone who used to train police. They would be taught on the range to shoot center of mass on a paper target, so they stare at the x ring and shoot there. then they'd do live drills with those laundry detergent like rounds. During actual fireing on a live target the ahnd got hit a lot. After review it wa sdetermined that officers shoot at what there focused on, mentally they see a gun, and focus on the gun, and shoot at that, since its the center of their vision. It takes a lot of live training to train yourself to take eyes off the gun and onto the target, and most trainings on paper, not actual people.
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