Cellular and network mechanisms of rhythmic recurrent activity in neocortex

Nat Neurosci. 2000 Oct;3(10):1027-34. doi: 10.1038/79848.


The neocortex generates periods of recurrent activity, such as the slow (0.1-0.5 Hz) oscillation during slow-wave sleep. Here we demonstrate that slices of ferret neocortex maintained in vitro generate this slow (< 1 Hz) rhythm when placed in a bathing medium that mimics the extracellular ionic composition in situ. This slow oscillation seems to be initiated in layer 5 as an excitatory interaction between pyramidal neurons and propagates through the neocortex. Our results demonstrate that the cerebral cortex generates an 'up' or depolarized state through recurrent excitation that is regulated by inhibitory networks, thereby allowing local cortical circuits to enter into temporarily activated and self-maintained excitatory states. The spontaneous generation and failure of this self-excited state may account for the generation of a subset of cortical rhythms during sleep.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Action Potentials / physiology
  • Animals
  • Biological Clocks / physiology*
  • Cats
  • Cerebral Cortex / cytology
  • Cerebral Cortex / drug effects
  • Cerebral Cortex / physiology*
  • Culture Techniques
  • Electrophysiology
  • Epilepsy / physiopathology
  • Ferrets
  • Nerve Net / cytology
  • Nerve Net / drug effects
  • Nerve Net / physiology*
  • Neurons / cytology
  • Neurons / drug effects
  • Neurons / physiology*
  • Periodicity*
  • Refractory Period, Electrophysiological / physiology
  • Sleep / physiology
  • Synapses / drug effects
  • Synapses / physiology