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Coexistence of gamma and high-frequency oscillations in rat medial entorhinal cortex in vitro

Lookup NU author(s): Professor Mark Cunningham, Professor Miles Whittington


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High frequency oscillations (> 80–90 Hz) occur in neocortex and hippocampus in vivo where they are associated with specific behavioural states and more classical EEG frequency bands. In the hippocampus in vitro these oscillations can occur in the absence of pyramidal neuronal somatodendritic compartments and are temporally correlated with on-going, persistent gamma frequency oscillations. Their occurrence in the hippocampus is dependent on gap-junctional communication and it has been suggested that these high frequency oscillations originate as collective behaviour in populations of electrically coupled principal cell axonal compartments. Here we demonstrate that the superficial layers of medial entorhinal cortex can also generate high frequency oscillations associated with gamma rhythms. During persistent gamma frequency oscillations high frequency oscillations occur with a high bispectral coherence with the field gamma activity. Bursts of high frequency oscillations are temporally correlated with both the onset of compound excitatory postsynaptic potentials in fast-spiking interneurones and spikelet potentials in both pyramidal and stellate principal neurones. Both the gamma frequency and high frequency oscillations were attenuated by the gap junction blocker carbenoxolone. These data suggest that high frequency oscillations may represent the substrate for phasic drive to interneurones during persistent gamma oscillations in the medial entorhinal cortex.

Publication metadata

Author(s): Whittington MA; Cunningham MO; Halliday DM; Davies CH; Traub RD; Buhl EH

Publication type: Article

Publication status: Published

Journal: The Journal of Physiology

Year: 2004

Volume: 559

Issue: 2

Pages: 347-353

ISSN (print): 0022-3751

ISSN (electronic): 1469-7793

Publisher: Wiley-Blackwell Publishing Ltd.


DOI: 10.1113/jphysiol.2004.068973

PubMed id: 15254156


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