Transcranial electric stimulation entrains cortical neuronal populations in rats

Simal Ozen, Anton Sirota, Mariano A. Belluscio, Costas A. Anastassiou, Eran Stark, Christof Koch, György Buzsáki

Research output: Contribution to journalArticlepeer-review

Abstract

Low intensity electric fields have been suggested to affect the ongoing neuronal activity in vitro and in human studies. However, the physiological mechanism of how weak electrical fields affect and interact with intact brain activity is not well understood. We performed in vivo extracellular and intracellular recordings from the neocortex and hippocampus of anesthetized rats and extracellular recordings in behaving rats. Electric fields were generated by sinusoid patterns at slow frequency (0.8, 1.25 or 1.7 Hz) via electrodes placed on the surface of the skull or the dura. Transcranial electric stimulation (TES) reliably entrained neurons in widespread cortical areas, including the hippocampus. The percentage of TES phase-locked neurons increased with stimulus intensity and depended on the behavioral state of the animal. TES-induced voltage gradient, as low as 1 mV/mm at the recording sites, was sufficient to phase-bias neuronal spiking. Intracellular recordings showed that both spiking and subthreshold activity were under the combined influence of TES forced fields and network activity. We suggest that TES in chronic preparations may be used for experimental and therapeutic control of brain activity.

Original languageEnglish
Pages (from-to)11476-11485
Number of pages10
JournalJournal of Neuroscience
Volume30
Issue number34
DOIs
StatePublished - 25 Aug 2010
Externally publishedYes

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