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The Journal of Neurophysiology Vol. 81 No. 3 March 1999, pp. 999-1013
Copyright ©1999 by the American Physiological Society
Department of Neuroscience and Anatomy, Milton S. Hershey Medical Center, Penn State University College of Medicine, Hershey, Pennsylvania 17033-2255
Roy, Stephane and
Kevin D. Alloway.
Stimulus-induced increases in the synchronization of local neural
networks in the somatosensory cortex: a comparison of stationary and
moving stimuli. Spontaneous and stimulus-induced responses were
recorded from neighboring groups of neurons by an array of electrodes
in the primary (SI) somatosensory cortex of intact, halothane-anesthetized cats. Cross-correlation analysis was used to
characterize the coordination of spontaneous activity and the responses
to peripheral stimulation with moving or stationary air jets. Although
synchronization was detected in only 10% (88 of 880) of the pairs of
single neurons that were recorded, cross-correlation analysis of
multiunit responses revealed significant levels of synchronization in
64% of the 123 recorded electrode pairs. Compared with spontaneous
activity, both stationary and moving air jets caused substantial
increases in the rate, proportion, and temporal precision of
synchronized activity in local regions of SI cortex. Among populations
of neurons that were synchronized by both types of air-jet stimulation,
the mean rate of synchronized activity was significantly higher during
moving air-jet stimulation than during stationary air-jet stimulation.
Moving air jets also produced significantly higher correlation
coefficients than stationary air jets in the raw cross-correlograms
(CCGs) but not in the shift-corrected CCGs. The incidence and rate of
stimulus-induced synchronization varied with the distance separating
the recording sites. For sites separated by 
300 µm, 80% of the
multiunit responses displayed significant levels of synchronization
during both types of air-jet stimulation. For sites separated by 
500
µm, only 37% of the multiunit responses were synchronized by
discrete stimulation with a single air jet. Measurements of the
multiunit CCG peak half-widths showed that the correlated activity
produced by moving air jets had slightly less temporal variability than
that produced by stationary air jets. These results indicate that
moving stimuli produce greater levels of synchronization than
stationary stimuli among local groups of SI neurons and suggest that
neuronal synchronization may supplement the changes in firing rate
which code intensity and other attributes of a cutaneous stimulus.
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