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The Journal of Neurophysiology Vol. 87 No. 4 April 2002, pp. 2137-2148
Copyright ©2002 by the American Physiological Society
1Department of Physics and 2Neurosciences Graduate Program, University of California at San Diego, La Jolla, California 92093
O'Connor, Sean M.,
Rune W. Berg, and
David Kleinfeld.
Coherent Electrical Activity Between Vibrissa Sensory Areas of
Cerebellum and Neocortex Is Enhanced During Free Whisking. J. Neurophysiol. 87: 2137-2148, 2002. We
tested if coherent signaling between the sensory vibrissa areas of
cerebellum and neocortex in rats was enhanced as they whisked in air.
Whisking was accompanied by 5- to 15-Hz oscillations in the mystatial
electromyogram, a measure of vibrissa position, and by 5- to 20-Hz
oscillations in the differentially recorded local field potential
(
LFP) within the vibrissa area of cerebellum and within the LFP
of primary sensory cortex. We observed that only 10% of the activity
in either cerebellum or sensory neocortex was significantly
phase-locked to rhythmic motion of the vibrissae; the extent of this
modulation is in agreement with the results from previous single-unit
measurements in sensory neocortex. In addition, we found that 40% of
the activity in the vibrissa areas of cerebellum and neocortex was
significantly coherent during periods of whisking. The relatively high
level of coherence between these two brain areas, in comparison with
their relatively low coherence with whisking per se, implies that the
vibrissa areas of cerebellum and neocortex communicate in a manner that
is incommensurate with whisking. To the extent that the vibrissa areas
of cerebellum and neocortex communicate over the same frequency band as
that used by whisking, these areas must multiplex electrical activity that is internal to the brain with activity that is that phase-locked to vibrissa sensory input.
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