Lower gamma band in the classification of left and right elbow movement in real and imaginary tasks

  • E. Y. VeslinEmail author
  • M. S. Dutra
  • L. Bevilacqua
  • L. S. C. Raptopoulos
  • W. S. Andrade
  • A. S. Pereira
  • M. Fiorani
  • J. G. M. Soares
Technical Paper


In this article, the activity of lower gamma band was used to classify right and left elbow movements performed from real and imaginary tasks in two different cognitive states: the preparation and the movement execution. Discriminability maps were used both to generalize the signal behavior of all the volunteers and to select time intervals of high discrimination among classes. The features extracted from chosen intervals were tested in eight different classification algorithms. To improve classes discrimination, LDA was used for dimensional reduction. Algorithms were tested using a fivefold cross-validation. The results showed similar signal activity for both real and imaginary actions, obtaining closer classification responses among all volunteers. The tested algorithm gave a mean classification success up to 70%, with minor differences between the type of task and the cognitive state.


Electroencephalography Machine learning Gamma band Brain–computer interfaces Rehabilitation robotics 



The authors would like to thank FINEP, CNPq, FAPERJ, Fundao COPPETEC and DIPPG/CEFET-RJ for supporting our works, the students Edwiges Beatriz Coimbra de Souza e Aline Macedo Rocha Rodriguez for helping in the EEG data acquisition, and Marco Vinicio Chiorri for technical assistance.


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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.Robotics Laboratory, Department of Mechanical EngineeringFederal University of Rio de JaneiroRio de JaneiroBrazil
  2. 2.Department of Civil EngineeringFederal University of Rio de JaneiroRio de JaneiroBrazil
  3. 3.Federal Center of Technological Education Celso Suckow da Fonseca CEFET/RJNova IguaçuBrazil
  4. 4.Laboratory of Cognitive Physiology, Institute of Biophysics Carlos Chagas FilhoFederal University of Rio de JaneiroRio de JaneiroBrazil
  5. 5.Rua Professor Rodolpho Paulo RoccoRio de JaneiroBrazil

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