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Updated: Jun 23, 2026

Excitotoxic Stimulation of Brain Microslices as an In vitro Model of Stroke
07:00

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Published on: February 4, 2014

The human K-complex represents an isolated cortical down-state.

Sydney S Cash1, Eric Halgren, Nima Dehghani

  • 1Department of Neurology, Epilepsy Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA. scash@partners.org

Science (New York, N.Y.)
|May 23, 2009
PubMed
Summary
This summary is machine-generated.

The largest human EEG events, K-complexes (KCs) during sleep, originate from outward dendritic currents in cortical layers. This signifies a decline in network activity, revealing KCs as isolated "down-states" crucial for sleep and memory.

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Area of Science:

  • Neuroscience
  • Clinical Neurology
  • Sleep Science

Background:

  • The electroencephalogram (EEG) is vital in neurology but lacks microphysiological detail on current generation.
  • K-complexes (KCs) are prominent EEG events during slow-wave sleep, poorly understood at the cellular level.

Purpose of the Study:

  • To elucidate the microphysiological sources of human K-complexes in the EEG.
  • To characterize the network activity changes associated with KCs.

Main Methods:

  • Analysis of microphysiological recordings during human slow-wave sleep.
  • Correlation of EEG signals with neuronal firing and network activity.

Main Results:

  • K-complexes are generated by outward dendritic currents in middle and upper cortical layers.
  • KCs are associated with decreased broadband EEG power and neuronal firing, indicating reduced network activity.
  • These findings identify KCs as isolated cortical "down-states".

Conclusions:

  • Human KCs represent a fundamental cortico-thalamic processing mode, analogous to animal
  • down-states.
  • The identified mechanism of KC generation supports their proposed roles in sleep preservation and memory consolidation.