EEG Classification of Forearm Movement Imagery Using a Hierarchical Flow Convolutional Neural Network

Ji Hoon Jeong, Byeong Hoo Lee, Dae Hyeok Lee, Yong Deok Yun, Seong Whan Lee

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Recent advances in brain-computer interface (BCI) techniques have led to increasingly refined interactions between users and external devices. Accurately decoding kinematic information from brain signals is one of the main challenges encountered in the control of human-like robots. In particular, although the forearm of an upper extremity is frequently used in daily life for high-level tasks, only few studies addressed decoding of the forearm movement. In this study, we focus on the classification of forearm movements according to elaborated rotation angles using electroencephalogram (EEG) signals. To this end, we propose a hierarchical flow convolutional neural network (HF-CNN) model for robust classification. We evaluate the proposed model not only with our experimental dataset but also with a public dataset (BNCI Horizon 2020). The grand-average classification accuracies of three rotation angles yield 0.73 (±0.04) for the motor execution (ME) task and 0.65 (±0.09) for the motor imagery (MI) task across ten subjects in our experimental dataset. Further, in the public dataset, the grand-averaged classification accuracies were 0.52 (±0.03) for ME and 0.51 (±0.04) for MI tasks across fifteen subjects. Our experimental results demonstrate the possibility of decoding complex kinematics information using EEG signals. This study will contribute to the development of a brain-controlled robotic arm system capable of performing high-level tasks.

Original languageEnglish
Article number9046799
Pages (from-to)66941-66950
Number of pages10
JournalIEEE Access
Publication statusPublished - 2020


  • Brain-computer interface (BCI)
  • convolutional neural network (CNN)
  • electroencephalogram (EEG)
  • forearm motor execution and motor imagery

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)


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