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Attenuation and Delay of Remote Potentials Evoked by Direct Electrical Stimulation During Brain Surgery

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Abstract

Direct electrical stimulation (DES) is used to perform functional brain mapping during awake surgery but its electrophysiological effects remain by far unknown. DES may be coupled with the measurement of evoked potentials (EPs) to study the conductive and integrative properties of activated neural ensembles and probe the spatiotemporal dynamics of short- and long-range networks. We recorded ECoG signals on two patients undergoing awake brain surgery and measured EPs on functional sites after cortical stimulations, using combinations of stimulation parameters. EPs were similar in shape but delayed in time and attenuated in amplitude when elicited from a different gyrus or remotely from the recording site. We were able to trigger remote EPs using low stimulation intensities. We propose different activation and electrophysiological propagation mechanisms following DES based on activated neural elements.

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Funding

Research supported by the LabEx NUMEV project (n° ANR-10-LABX-20) funded by the French government’s “Investissements d’Avenir” program managed by the French National Research Agency (ANR) and complementary grants from the Institut Universitaire de France and INSERM laboratory (U1093).

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Correspondence to David Guiraud or Francois Bonnetblanc.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Handling Editor: Christian-George Bénar, PhD.

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Boyer, A., Duffau, H., Mandonnet, E. et al. Attenuation and Delay of Remote Potentials Evoked by Direct Electrical Stimulation During Brain Surgery. Brain Topogr 33, 143–148 (2020). https://doi.org/10.1007/s10548-019-00732-w

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  • DOI: https://doi.org/10.1007/s10548-019-00732-w

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