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Health Fusion: Your brain keys into unfamiliar voices while you sleep

While you snooze, your brain stays busy and alert. It pays attention to unfamiliar voices. In this episode of NewsMD's "Health Fusion," Viv Williams shares details of emerging research about how your brain keeps working while you count sheep.

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While you sleep, your brain stays busy
Photo illustration by Metro Newspaper Service

ROCHESTER — Have you ever heard that we only ever use about 10% of our brains? Emerging research about the complexity of our brains contradicts that idea.

Take, for example, new research from the University of Salzburg in Austria. Neuroscientists there have found that while you snooze, your brain stays busy and pays attention to unfamiliar voices. They say that during sleep your brain is doing a balancing act. It helps protect your sleep, but also it stays alert to help you know if you should wake up.

By measuring the brain activity of people exposed to familiar and unfamiliar voices while they slept, the researchers found that your brain enters into what they call a "sentinel processing mode." During that state, your brain is asleep, but it can still process important info, such as the presence of unfamiliar voices.

They also found evidence that the brain may be able to learn when you're asleep. Because brainwaves changed as unfamiliar voices became more familiar over time.

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While your mind and body rest, it seems that your brain continues to work to promote good health.

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The research is published in JNeurosci.

Follow the Health Fusion podcast on Apple , Spotify , and Google Podcasts.

For comments or other podcast episode ideas, email Viv Williams at vwilliams@newsmd.com . Or on Twitter/Instagram/FB @vivwilliamstv.

Viv Williams hosts the NewsMD podcast and column, "Health Fusion." She is an Emmy (and other) award-winning health and medical reporter whose stories have run on TV, digital and newspaper outlets nationwide. Viv is passionate about boosting people's health and happiness by helping them access credible, reliable and research-based health information from top experts. She regularly interviews experts and patients from leading medical institutions, such as Mayo Clinic.
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