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General Commentary ARTICLE

Front. Hum. Neurosci., 02 October 2015 | https://doi.org/10.3389/fnhum.2015.00542

Corrigendum: EEG beta suppression and low gamma modulation are different elements of human upright walking

  • 1Laboratory of Brain–Computer Interfaces, Institute for Knowledge Discovery, Graz University of Technology, Graz, Austria
  • 2BioTechMed-Graz, Graz, Austria
  • 3Rehabilitation Clinic Judendorf-Strassengel, Judendorf-Strassengel, Austria
  • 4Department of Biomechanical Engineering, Delft University of Technology, Delft, Netherlands

A corrigendum on
EEG beta suppression and low gamma modulation are different elements of human upright walking

by Seeber, M., Scherer, R., Wagner, J., Solis-Escalante, T., and Müller-Putz, G. R. (2014) Front. Hum. Neurosci. 8:485. doi: 10.3389/fnhum.2014.00485

In the Original Research Article there is a missing normalization by “N” in the formula on page 3. This formula describes the gait phase modulation (GPM) measure. The corrected formula is written below.

GPM(f)= 22 · σA(f) · N · n=0N1A(n,f) · e2πi·2·nN

In our original article, the description of the GPM formula as well as the reported results are correct. As properly stated in the commentary from Trenado (2015) to our original article, the normalization by N is necessary to scale the GPM magnitude in an interval from 0 to 1. In our calculations this normalization was already applied what is represented in the GPM values we reported in Table 1 and Figure 4 in the original publication.

In contrast to Trenado (2015) we suggest to use the GPM measure as complex number, not only it's magnitude. The GPM magnitude expresses it's strength, while the GPM angle represents the phase lag between behavior and amplitude envelop at a given carrier frequency and location in the brain. In our opinion it is a benefit of the GPM measure not only to describe the correlation between amplitude envelops of brain oscillations and behavior, i.e., walking patterns, but also to provide their phase relation.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

This work was supported by the European Union research project BETTER (ICT-2009.7.2-247935) (www.car.upm-csic.es/bioingenieria/better/), BioTechMed Graz and the Land Steiermark projects BCI4REHAB (bci.tugraz.at/bci4rehab) and rE(EG)map! (bci.tugraz.at/reegmap).

References

Trenado, C. (2015). Commentary: EEG beta suppression and low gamma modulation are different elements of human upright walking. Front. Hum. Neurosci. 9:380. doi: 10.3389/fnhum.2015.00380

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Keywords: electroencephalography (EEG), gait, brain mapping, motor cortex, magnetic resonance imaging

Citation: Seeber M, Scherer R, Wagner J, Solis-Escalante T and Müller-Putz GR (2015) Corrigendum: EEG beta suppression and low gamma modulation are different elements of human upright walking. Front. Hum. Neurosci. 9:542. doi: 10.3389/fnhum.2015.00542

Received: 13 August 2015; Accepted: 15 September 2015;
Published: 02 October 2015.

Edited and reviewed by: Sophie Molholm, Albert Einstein College of Medicine, USA

Copyright © 2015 Seeber, Scherer, Wagner, Solis-Escalante and Müller-Putz. 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) or licensor 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: Martin Seeber, seeber@tugraz.at