Unsupervised machine-learning classification of electrophysiologically active electrodes during human cognitive task performance

Krishnakant V. Saboo, Yogatheesan Varatharajah, Brent M. Berry, Vaclav Kremen, Michael R. Sperling, Kathryn A. Davis, Barbara C. Jobst, Robert E. Gross, Bradley Lega, Sameer A. Sheth, Gregory A. Worrell, Ravishankar K. Iyer, Michal T. Kucewicz

Research output: Contribution to journalArticle

Abstract

Identification of active electrodes that record task-relevant neurophysiological activity is needed for clinical and industrial applications as well as for investigating brain functions. We developed an unsupervised, fully automated approach to classify active electrodes showing event-related intracranial EEG (iEEG) responses from 115 patients performing a free recall verbal memory task. Our approach employed new interpretable metrics that quantify spectral characteristics of the normalized iEEG signal based on power-in-band and synchrony measures. Unsupervised clustering of the metrics identified distinct sets of active electrodes across different subjects. In the total population of 11,869 electrodes, our method achieved 97% sensitivity and 92.9% specificity with the most efficient metric. We validated our results with anatomical localization revealing significantly greater distribution of active electrodes in brain regions that support verbal memory processing. We propose our machine-learning framework for objective and efficient classification and interpretation of electrophysiological signals of brain activities supporting memory and cognition.

Original languageEnglish (US)
Article number17390
JournalScientific reports
Volume9
Issue number1
DOIs
StatePublished - Dec 1 2019

ASJC Scopus subject areas

  • General

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    Saboo, K. V., Varatharajah, Y., Berry, B. M., Kremen, V., Sperling, M. R., Davis, K. A., Jobst, B. C., Gross, R. E., Lega, B., Sheth, S. A., Worrell, G. A., Iyer, R. K., & Kucewicz, M. T. (2019). Unsupervised machine-learning classification of electrophysiologically active electrodes during human cognitive task performance. Scientific reports, 9(1), [17390]. https://doi.org/10.1038/s41598-019-53925-5