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This is Scientific American's 60-Second Mind, I'm Karen Hopkin. Got a minute?

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Consciousness is one of the biggest mysteries of the brain.

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But maybe even more intriguing is what goes on when we lose consciousness and how do we find our way back?

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Now, researchers studying anesthetized rats have discovered a handful of activity patterns that may help mark the path to consciousness.

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The findings are in the Proceedings of the National Academy of Sciences.

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The anesthetized brain is not actually quiet.

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It shows patterns of spontaneous activity that can change over time.

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But as the brain wakes, how do these random splashes of activity morph into the vigorous chatter of the conscious mind?

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To find out, researchers looked for common patterns in the brain activity of rats as they were put under anesthesia and brought back.

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And they discovered a number of patterns that took place consistently.

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A few seemed to serve as stepping stones from deep anesthesia to waking,

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as if the brain were finding its way through a maze of possible activity states on the way back to consciousness.

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Knowing how the brain reboots itself may help physicians better predict recovery from brain injury or even coma,

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and should lead to a better understanding of how to keep us under.

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Thanks for the minute, for Scientific American's 60-Second Mind.I'm Karen Hopkin.

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