Here is an article on how Fear can effect one's survival skills, even those gained through Training.
http://www.lwcbooks.com/articles/anatomy.html
This article involved 85 TRAINED Police Officers and how they performed in a scenario where a subject, armed with a knife, attacked them.
The attacker, who was dressed in a combatives suit, was told that during mid contact, they were to pull a knife (that they had concealed), flash it directly at the officer, yell "I’m going to kill you pig," and then engage the officer physically. The results were remarkable:
3/85 saw the knife prior to contact
10/85 realized that they were being stabbed repeatedly during the scenario
72/85 did not realize that they were being assaulted with a knife until the scenario was over, and the officers were advised to look at their uniforms to see the simulated thrusts and slices left behind by the chalked training knives
The article goes on to explain the results of Heart Rate on the body from it's effect on hearing and vision to how one is unable to perform tasks requiring fine motor skills. The body goes into total survival mode.
Remember, in the scenario quoted, these were 85 Police Officers with extensive training. (for example, NYPD recruits get 9 weeks of skill/ability training and 2 weeks of firearms training.)
For the
average citizen any training beyond Knowlege of the Law, Firearm Safety, and Basic Firearm Skills will most likely be a major expense without benefit (except for the cool certificates).
A 2007 Rand study of NYPD showed that those 2 weeks of firearm training and subsequent qualification requirements (78% hits on targets) only yielded an 18% hit rate when they encountered a shooting situation.
My point is not to shun training but to merely point out,
again for the average citizen, all these Advanced classes will not yield the benefits that those selling the service will tout. The only exception might be for those who care to spend the time and money for many more hours than the one or two day classes will provide. To train to a level that will overcome one's basic survival instincts takes far longer than what you'll get for even, to use one school's price list, $750 which gives 5 days of training.
In the end, just like the number one rule in Combat, (No Battle Plan survives the first shot). When your heart rate goes up due to fear instinct will take over. Unless you are a "Professional" I seriously doubt that you will have invested the time and money necessary to make a difference in an "unscripted SD Scenario".
For the majority (average citizens), training in the basics like Law, Safety, and Simple marksmanship, with tips on maintaining situational awareness, will go a lot farther to keeping you safe than spending a ton of money on all the advanced "tactical" training that is now being pushed. I'd be pleased if every gun owner received some form of formal training in the essential basics. Beyond that it's a matter of choice. In a take-off of an old Platoon Sergeant's statement, "Spend it if you got it".