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The Journal of Neurophysiology Vol. 84 No. 3 September 2000, pp. 1505-1518
Copyright ©2000 by the American Physiological Society
1Department of Psychology, University of Colorado, Boulder 80309-0345; and 2Department of Anatomy and Neurobiology, Colorado State University, Fort Collins, Colorado 80523
Jones, Michael S.,
Kurt D. MacDonald,
ByungJu Choi,
F. Edward Dudek, and
Daniel S. Barth.
Intracellular Correlates of Fast (>200 Hz) Electrical
Oscillations in Rat Somatosensory Cortex. J. Neurophysiol. 84: 1505-1518, 2000. Oscillatory activity in excess of
several hundred hertz has been observed in somatosensory evoked
potentials (SEP) recorded in both humans and animals and is attracting
increasing interest regarding its role in brain function. Currently,
however, little is known about the cellular events underlying these
oscillations. The present study employed simultaneous in-vivo
intracellular and epipial field-potential recording to investigate the
cellular correlates of fast oscillations in rat somatosensory cortex
evoked by vibrissa stimulation. Two distinct types of fast oscillations were observed, here termed "fast oscillations" (FO) (200-400 Hz) and "very fast oscillations" (VFO) (400-600 Hz). FO coincided with
the earliest slow-wave components of the SEP whereas VFO typically were
later and of smaller amplitude. Regular spiking (RS) cells exhibited
vibrissa-evoked responses associated with one or both types of fast
oscillations and consisted of combinations of spike and/or subthreshold
events that, when superimposed across trials, clustered at latencies
separated by successive cycles of FO or VFO activity, or a combination
of both. Fast spiking (FS) cells responded to vibrissae stimulation
with bursts of action potentials that closely approximated the
periodicity of the surface VFO. No cells were encountered that produced
action potential bursts related to FO activity in an analogous fashion.
We propose that fast oscillations define preferred latencies for action
potential generation in cortical RS cells, with VFO generated by
inhibitory interneurons and FO reflecting both sequential and recurrent
activity of stations in the cortical lamina.
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