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J Physiol Volume 550, Number 2, 529-534, July 15, 2003 DOI: 10.1113/jphysiol.2003.045674
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J Physiol (2003), 550.2, pp. 529-534
© Copyright 2003 D 2003 The Physiological Society
DOI: 10.1113/jphysiol.2003.045674

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

Stuart N. Baker *, Gabriel Curio † and Roger N. Lemon ‡

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