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J Neurophysiol 84: 1505-1518, 2000;
0022-3077/00 $5.00
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The Journal of Neurophysiology Vol. 84 No. 3 September 2000, pp. 1505-1518
Copyright ©2000 by the American Physiological Society

Intracellular Correlates of Fast (>200 Hz) Electrical Oscillations in Rat Somatosensory Cortex

Michael S. Jones,1 Kurt D. MacDonald,1 ByungJu Choi,2 F. Edward Dudek,2 and Daniel S. Barth1

 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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