When an organism is in danger there are a few ways it can react. If a predator is after them then running away can be effective, but hiding is a way to avoid detection in the first place. Think of a rabbit, they will hunker down until you are practically on top of them before they run off.
That instinct to hide is what is making you freeze and be quiet. These days fear doesn’t typically come from things trying to eat you, but the instinct remains.
The body’s trauma response is categorized as:
Fight
Flight
Freeze
Fawn
When scared or shocked, the adrenaline dump triggers the sympathetic nervous system of the autonomic system. It’s a primitive response that (autonomic=automatic [roughly]) is a hold over from survival instinct. Some fight, some run, some hide, and some just freeze. No way of really telling who does what.
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