Intraoperative microseizure detection using a high-density micro-electrocorticography electrode array

James Sun, Katrina Barth, Shaoyu Qiao, Chia Han Chiang, Charles Wang, Shervin Rahimpour, Michael Trumpis, Suseendrakumar Duraivel, Agrita Dubey, Katie E. Wingel, Iakov Rachinskiy, Alex E. Voinas, Breonna Ferrentino, Derek G. Southwell, Michael M. Haglund, Allan H. Friedman, Shivanand P. Lad, Werner K. Doyle, Florian Solzbacher, Gregory CoganSaurabh R. Sinha, Sasha Devore, Orrin Devinsky, Daniel Friedman, Bijan Pesaran, Jonathan Viventi

Research output: Contribution to journalArticlepeer-review


One-third of epilepsy patients suffer from medication-resistant seizures. While surgery to remove epileptogenic tissue helps some patients, 30-70% of patients continue to experience seizures following resection. Surgical outcomes may be improved with more accurate localization of epileptogenic tissue. We have previously developed novel thin-film, subdural electrode arrays with hundreds of microelectrodes over a 100-1000mm2 area to enable high-resolution mapping of neural activity. Here, we used these high-density arrays to study microscale properties of human epileptiform activity. We performed intraoperative micro-electrocorticographic recordings in nine patients with epilepsy. In addition, we recorded from four patients with movement disorders undergoing deep brain stimulator implantation as non-epileptic controls. A board-certified epileptologist identified microseizures, which resembled electrographic seizures normally observed with clinical macroelectrodes. Recordings in epileptic patients had a significantly higher microseizure rate (2.01events/min) than recordings in non-epileptic subjects (0.01events/min; permutation test, P = 0.0068). Using spatial averaging to simulate recordings from larger electrode contacts, we found that the number of detected microseizures decreased rapidly with increasing contact diameter and decreasing contact density. In cases in which microseizures were spatially distributed across multiple channels, the approximate onset region was identified. Our results suggest that micro-electrocorticographic electrode arrays with a high density of contacts and large coverage are essential for capturing microseizures in epilepsy patients and may be beneficial for localizing epileptogenic tissue to plan surgery or target brain stimulation.

Original languageEnglish (US)
Article numberfcac122
JournalBrain Communications
Issue number3
StatePublished - 2022


  • ECoG
  • epilepsy
  • intraoperative
  • microelectrode
  • microseizure

ASJC Scopus subject areas

  • Neurology
  • Psychiatry and Mental health
  • Biological Psychiatry
  • Cellular and Molecular Neuroscience


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