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First published online on June 13, 2003.
 Copyright © 2003 by The Physiological Society
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Received April 23, 2003
Accepted after revision June 9, 2003

EEG oscillations at 600 Hz are macroscopic markers for cortical spike bursts

S. N. Baker1*, Gabriel Curio2, and Roger N. Lemon3

1 Department of Anatomy, University of Cambridge, Cambridge CB2 3DY, UK
2 Neurophysics Group, Department of Neurology, Klinikum Benjamin Franklin, Freie Universitaet, 12200 Berlin, Germany
3 Sobell Department of Neurophysiology, Institute of Neurology, Queen Square, London WC1N 3BG, UK

* To whom correspondence should be addressed. E-mail: snb11{at}cam.ac.uk.

The human electroencephalogram (EEG) is generated predominantly by synchronised cortical excitatory postsynaptic potentials oscillating at frequencies <100 Hz. Unusually, EEG responses to electrical nerve stimulation contain brief bursts of high-frequency (600 Hz) wavelets. Here we show, in awake monkeys, that a subset of primary somatosensory cortex single units consistently fires both bursts and single spikes phase-locked to EEG wavelets. Spike bursts were also evoked by tactile stimuli, proving that this is a natural response mode. EEG wavelets at 600 Hz may therefore permit non-invasive assessment of population spike timing in human cortex.




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