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J Neurophysiol 76: 4202-4205, 1996;
0022-3077/96 $5.00
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Journal of Neurophysiology, Vol 76, Issue 6 4202-4205, Copyright © 1996 by APS

ARTICLES

Electric field suppression of epileptiform activity in hippocampal slices

B. J. Gluckman, E. J. Neel, T. I. Netoff, W. L. Ditto, M. L. Spano and S. J. Schiff
Naval Surface Warfare Center, White Oak Laboratory, Silver Spring, Maryland 20903, USA.

1. The effects of relatively small external DC electric fields on synchronous activity in CA1 and CA3 from transverse and longitudinal type hippocampal slices were studied. 2. To record neuronal activity during significant field changes, differential DC amplification was employed with a reference electrode aligned along an isopotential with the recording electrode. 3. Suppression of epileptiform activity was observed in 31 of 33 slices independent of region studied and type of slice but was highly dependent on field orientation with respect to the apical dendritic-somatic axis. 4. Modulation of neuronal activity in these experiments was readily observed at field strengths < or = 5-10 mV/mm. Suppression was seen with the field oriented (positive to negative potential) from the soma to the apical dentrites. 5. In vivo application of these results may be feasible.




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