Vagus Nerve Stimulation Induced Synchrony Modulation of Local Field Potential in the Rat Cerebral Cortex

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  • Kano Ryuji
    Department of Mechano-informatics, Graduate School of Information Science and Technology, The University of Tokyo
  • Usami Kenichi
    Department of Neurosurgery, Graduate School of Medicine, The University of Tokyo
  • Noda Takahiro
    Department of Mechano-informatics, Graduate School of Information Science and Technology, The University of Tokyo
  • Shiramatsu Tomoyo I.
    Department of Mechano-informatics, Graduate School of Information Science and Technology, The University of Tokyo
  • Kanzaki Ryohei
    Research Center for Advanced Science and Technology, The University of Tokyo
  • Kawai Kensuke
    Department of Neurosurgery, Graduate School of Medicine, The University of Tokyo
  • Takahashi Hirokazu
    Department of Mechano-informatics, Graduate School of Information Science and Technology, The University of Tokyo Research Center for Advanced Science and Technology, The University of Tokyo PRESTO, JST

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  • ラット大脳皮質の局所電場電位における迷走神経刺激による同期度の変化
  • ラット ダイノウ ヒシツ ノ キョクショ デンバ デンイ ニ オケル メイソウ シンケイ シゲキ ニ ヨル ドウキド ノ ヘンカ

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Abstract

Vagus Nerve Stimulation (VNS) is a surgical treatment for intractable epilepsy. Although VNS has treated more than 60,000 patients, the precise therapeutic mechanism of action have not been elucidated. Here we hypothesize that VNS modulates the local synchronization of cortical activities and thus inhibits a seizure. In order to verify this hypothesis, we mapped local field potentials (LFPs) with high-spatial resolution using a microelectrode array from the temporal cortices of adult rats and analyzed VNS-induced phase modulation at a local network level. VNS significantly increased phase locking value (PLV), an index of synchronization, specifically at the gamma band. The optimal stimulation pulse of VNS was 0.5 mA and delivered at 10 Hz. This PLV modulation was most effective when the inter-electrode distance was about 1.6 mm. Gamma-band PLVs within the auditory cortex increased more significantly than those between the auditory and non-auditory cortices, while alpha- and low-beta PLV exhibited more synchronization between the auditory and non-auditory cortices. These results demonstrate that VNS modulates cortical synchronization in a band specific manner, and have some implications for the mechanism of action of VNS.

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