Cortical Neurons May Consolidate Memories During Slow Wave Sleep

Scientists previously thought cortical neurons remained silent during delta waves, but new evidence from rats shows some cells fire in a pattern reflective of memorizing a task.

emma yasinski
| 3 min read
rat sleep delta wave memory consolidation cortical neuron activity

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Delta waves, patterns of slow, synchronized brain activity that occur during deep sleep, have long been considered “periods of silence,” in which neurons in the cortex stop firing. But these intervals may not be silent after all, researchers reported yesterday in Science. In rats, some cortical neurons remain active during delta waves, and their firing may even be involved in consolidating memories.

“The paper is absolutely fascinating and will have a large impact on the field of memory and sleep,” says Björn Rasch, a biopsychologist at the University of Fribourg in Switzerland who was not involved in the study. He suggests it might even help explain surprising results in his own research in humans published earlier this year that indicated participants may better remember words from a foreign language if they are replayed during delta wave sleep than if they are never repeated during sleep. The latest study “challenges our ...

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  • emma yasinski

    Emma Yasinski

    Emma is a Florida-based freelance journalist and regular contributor for The Scientist.
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