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Front. Hum. Neurosci. | doi: 10.3389/fnhum.2019.00141

A Riemannian modification of Artifact Subspace Reconstruction for EEG artifact handling

  • 1Abteilung Neuropsychologie, Department für Psychologie, Fakultät für Medizin und Gesundheitswissenschaften, Universität Oldenburg, Germany
  • 2European Medical School Oldenburg-Groningen (EMS), Germany
  • 3Department of Psychology, University of Oldenburg, Germany

Objective: Artifact Subspace Reconstruction (ASR) is an adaptive method for the online or offline correction of artifacts comprising multichannel EEG recordings. It repeatedly computes a principal component analysis on covariance matrices to detect artifacts based on their statistical properties in the component subspace. We adapted the existing ASR implementation by using Riemannian geometry for covariance matrix processing. EEG data that were recorded on smartphone in both outdoors and indoors conditions were used for evaluation (N = 27). A direct comparison between the original artifact subspace reconstruction (ASR) and Riemannian ASR (rASR) was conducted for three performance measures: reduction of eye-blinks (sensitivity), improvement of visual-evoked potentials (specificity), and computation time (efficiency). Compared to ASR, our rASR algorithm performed favourably on all three measures. We conclude that rASR is suitable for the offline and online correction of multichannel EEG data acquired in laboratory and in field conditions.

Keywords: Riemann, mobile EEG, ASR, BCI (Brain Computer Interface), neuroergonomics, PGA, PCA

Received: 29 Aug 2018; Accepted: 11 Apr 2019.

Edited by:

Fabien Lotte, Institut National de Recherche en Informatique et en Automatique (INRIA), France

Reviewed by:

Johanna Wagner, University of California, San Diego, United States
Sylvain Chevallier, Université de Versailles Saint-Quentin-en-Yvelines, France  

Copyright: © 2019 Blum, Jacobsen, Bleichner and Debener. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mrs. Sarah Blum, Abteilung Neuropsychologie, Department für Psychologie, Fakultät für Medizin und Gesundheitswissenschaften, Universität Oldenburg, Oldenburg, 26129, Lower Saxony, Germany,