Yawning Shifts Brain Fluids: MRI study finds CSF and blood flows change; hints at brain homeostasis

New research reveals yawning does more than signal tiredness. Scientists observed that yawning causes cerebrospinal fluid to move away from the brain. It also increases blood flow into the brain. This suggests yawning plays a role in brain pressure and circulation balance. Each person’s yawn pattern is unique, like a fingerprint.

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