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Biologists have shown that the tiny and simple aquatic creatures called hydra, which do not have brains, periodically drop into a rest state that meets the essential criteria for sleep. (From 2021)

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64,740 просмотров • 3 лет назад •via X (Twitter)

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Like a stadium full of sports fans doing the wave, neurons coordinate their electrical signals in rhythmic patterns that sweep across the cortex, the brain’s outermost layer. Recent studies in humans and animals have shown these patterns, called traveling waves, can take on complex shapes, among them a rotating spiral that has been observed during deep sleep, memory retrieval, and other brain processes. A new study has now captured the fast-spinning waves spanning whole brains, offering clues to how they’re organized and what they might do. Learn more: News from Science

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