2021 Cilt 26 Sayı 1

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EEG analysis of real and imaginary arm movements by spectral coherence
(Bursa Uludağ Üniversitesi, 2021-01-23) Özmen, Nurhan Gürsel
Revealing the information between similar patterns of brain for areal motor task and its imaginary equivalent can be means to clarify movement intentions and help to improve Brain Computer Interfaces (BCI)s. This paperuses spectral coherence to assess the functional interactions between neural regions engaged in a real and an imagined arm movement task. Magnitude squared coherence values were calculatedfor two specific bands ofElectroencephalogram (EEG) that are 8–12 Hzalpha band and 13–20 Hz betafor 48 channelsfrom selectedregions of interest (ROIs). The coherence values are transferred into surfacemaps. We try to explainhowmotor cognition in these regions are relevant with the literature. Themaximum coherence is observed between the channels in the same hemisphere and surrounding closest channels located vertically and horizontally based on the 10-20 electrode placement. Our results that the supplementary motor area, the premotor, prefrontal, primary motor cortex and the parietal cortexplay a role in facilitating real and imaginary motor movements, are in good accordance with the previous studies. Further research can be put on spectral coherence patterns which would be a possible means for prosthetic-interactive BCI systems, interactive multimedia applications, and emerging EEG-based biometric recognition areas.