The Vestibular System · why the room spins, and why it's rarely your neck前庭与平衡 · 天旋地转, 多半不是颈椎病

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平衡是三路信息投票 · 内耳里真的压着小石头 · 耳石掉错房间就天旋地转 · 治疗是复位不是输液 · 突发持续眩晕要排除卒中

Balance is a three-way vote

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平衡是三路信息的投票

You stay upright not because of one organ, but because three streams of information take a vote in your brain.

They are: the vestibular organ in your inner ear, measuring head rotation and acceleration; your eyes, using the outside world as a reference; and proprioception, reporting pressure under your feet and the angles of your joints from the ground up. When all three agree, the world feels stable — so stable you never notice it.

When the three disagree, your brain can't reconcile them, and you feel sick. That's motion sickness: you look down at your phone in a moving car, your eyes say nothing is moving (the cabin is still), your inner ear says you're swaying. The two don't match, and nausea follows (Bertolini 2016).

There's a telling counter-proof: people who have lost inner-ear vestibular function entirely don't get motion sick (Bertolini 2016). A conflict needs two voices; take one away and there's no argument.

And a test you can run today: close your eyes and stand on one leg. If you topple immediately, it means you've been propping yourself up with your eyes, and your proprioceptive channel is the weak one. Lose one of the three, and the rest work overtime.

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