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The Journal of Neurophysiology Vol. 82 No. 3 September 1999, pp. 1599-1609
Copyright ©1999 by the American Physiological Society
Department of Psychology, University of Colorado, Boulder, Colorado 80309-0345
Jones, Michael S. and
Daniel S. Barth.
Spatiotemporal Organization of Fast (>200 Hz) Electrical
Oscillations in Rat Vibrissa/Barrel Cortex. J. Neurophysiol. 82: 1599-1609, 1999. A 64-channel electrode array
was used to study the spatial and temporal characteristics of fast
(>200 Hz) electrical oscillations recorded from the surface of rat
cortex in both awake and anesthetized animals. Transient vibrissal
displacements were effective in evoking oscillatory responses in the
vibrissa/barrel field and were tightly time-locked to stimulus onset,
coinciding with the earliest temporal components of the coincident
slow-wave response. Vibrissa-evoked fast oscillations exhibited
modality specificity and were earliest and of largest amplitude over
the cortical barrel, which corresponded to the vibrissa stimulated,
spreading to sequentially engage neighboring barrels over subsequent
oscillatory cycles. The response was enhanced after paired-vibrissal
stimulation and was sensitive to time delays between movement of
separate vibrissae. These data suggest that spatiotemporal interactions
between fast oscillatory bursts in the barrel field may play a role in
rapidly integrating information from the vibrissal array during the
earliest cortical response to somatosensory stimulation.
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