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The Journal of Neuroscience, March 15, 2003, 23(6):2502
Submillisecond Synchronization of Fast Electrical Oscillations in
Neocortex
Daniel S.
Barth
Department of Psychology, University of Colorado, Boulder, Colorado
80309-0345
Fast electrical oscillations (FOs; >200 Hz) in the sensory
neocortex can be recorded in a variety of species, including humans, and may reflect extremely fast integration of sensory information. This
report demonstrates that, in the whisker representation of rat cortex,
multivibrissa stimulation produces propagating FO field potential
patterns and time-locked unit activity that are sensitive to
submillisecond delays in interstimulus intervals. We propose that FOs
may be produced by synchronized population spikes and their
subthreshold sequelas in cortical pyramidal cells. FOs serve to
accurately mark stimulus onset as a phase-encoded excitatory signal,
producing phase-sensitive interactions that, in the context of
exploratory whisking, may extract features of an object under exploration.
Key words:
fast oscillations; ripples; barrel; whisker; vibrissa; synchronization; somatosensory
Copyright © 2003 Society for Neuroscience 0270-6474/03/2362502-09$05.00/0
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