00:00We usually treat defensiveness like a bad attitude, when it's actually a biological survival reflex, called the DACC alarm.
00:09Take an exhausted worker hearing their boss say they messed up a major report.
00:13Those words enter the brain and immediately trigger the DACC, lighting it up like a siren.
00:19But here's the friction. That is the exact same neural region that processes physical distress.
00:25To your brain's hardware, there is zero difference between receiving a harsh critique and stubbing your toe.
00:32Because early humans relied entirely on the tribe for survival, being rejected meant certain death.
00:37So evolution essentially co-opted the physical pain system to keep you safely attached to the group.
00:43Which means if you're sleep-deprived or hungry, this shared alarm is already running hot.
00:48A lowered threshold means even mild feedback will register as a severe, life-threatening attack.
00:54So back to that exhausted worker getting critiqued by the boss.
00:58To their nervous system, that feedback wasn't just uncomfortable.
01:01It was a literal punch to the face.
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