The blank-out under social pressure is a measurable survival reflex: movement stalls, heart rate drops, and the mind empties. It hits the most anxious people hardest. It is not a personal failing, it is your nervous system running an old program at the wrong time.
When researchers put people under social threat and measured their bodies, they found a coordinated freeze: reduced movement, a dip in heart rate, and a drop in the cognitive resources you need to find words. The more socially anxious the person, the stronger the response.
This reframes the whole experience. The freeze is not evidence that you are bad with people. It is a reflex, and reflexes respond to one thing: repeated, safe exposure. Train the trigger enough times and the program stops firing. That is the entire premise behind practicing the conversation before you have to have it.