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Brain's 'slow waves': Scientists probe source of pulsing signal in sleeping brain

New findings clarify where and how the brain's "slow waves" originate. These rhythmic signal pulses, which sweep through the brain during deep sleep, are assumed to play a role in important processes such as consolidation of memory. For the first time, researchers have shown conclusively that slow waves start in the cerebral cortex. They also found that such a wave can be set in motion by a local cluster of just 50 to 100 neurons.
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