In life-or-death situations, police officers usually only have a fraction of a second before determining whether their target is brandishing a weapon and whether to pull the trigger to subdue the assailant. That split-second decision-making could be aided by Quiet Eye training, according to a study published Tuesday by University of Calgary kinesiology professor Joan Vickers and Minnesota police psychology expert Bill Lewinski. "Quiet Eye is the last thing you see before you have to make a critical movement," says Vickers, who pioneered Quiet Eye training and introduced it in sports, medicine and now law enforcement.