My brain freezes under stress — why?
'Brain freeze' under stress matches acute prefrontal cortex inhibition by the amygdala. Executive functions (reasoning, language, planning) are cut in under 250ms when the alarm system takes over.
Why it happens — the mechanism
The amygdala detects threat 60ms before cortex. It signals locus coeruleus releasing noradrenaline + cortisol → prefrontal inhibition. Consequence: impossible to think, speak coherently, plan. You fall back on habits (good or bad).
How the Avikzar System answers it
That's why Avikzar Krav Maga trains the body, not the head. Under stress your head doesn't work — only what the body has learned executes.
Yehouda Avikzar (10th Dan) — Freezing isn't your fault — it's your biology. But not training after experiencing one is your responsibility.
Frequently asked questions
How to avoid this freeze?
You don't avoid it, you anticipate. Train the body to function without cortical brain.
Other reactions to danger
Train the reflexes that bypass freeze
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