CHANGES IN PATTERNS OF SENSORIMOTOR EEG RHYTHMS DURING MOTOR IMAGERY


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Abstract

Aim - the determination of common and individual characteristics in patterns of sensorimotor rhythms of EEG during motor imagery in upper and lower limbs. Materials and methods. 20 right-handed students of Samara State Medical University at the age of 18-20 years took part in the investigation, signing informed consent. Monopolar EEG was recorded with the use of 128-channel EEG recording system (BP-010302 BrainАmpStandart 128) at rest and during the imagining of monovector movements in 4 limbs (bending fingers of the right hand, bending fingers of the left hand, dorsiflexion of the right foot, dorsiflexion of the left foot); and during the imagining of triple-vector movements in the dominant hand (fingers bending, elbow flexion, wrist rotation). The following programs and methods were used during the processing of EEG: MatLab, IBM SPSS Statistics 22, ICA (independent component analysis), CSP (Common Spatial Pattern), LORETA. Results. It was found out that alpha2- and beta2- EEG frequency bands are highly significant for the formation of contralateral activation focus during motor imagery in the 4 limbs. ERD / ERS of the EEG rhythms were more pronounced during imagining movements in the dominant limbs (right hand, right leg) than in non-dominant.We found individuality of responses of sensorimotor EEG rhythms in addition to the general trends of EEG changes during imagination of one-type movement in the 4 limbs. The significance of changes in the power of EEG sensorimotor rhythms for differentiating 3 degrees of freedom during motor imagery in one limb was not found. Conclusion. Event-related desynchronization/synchro-nization(ERD/ERS) of sensorimotor EEG rhythms related to motor imagery has individual characteristics and their classification will lead to the significant increase of the number of degrees of freedom in creation and implementation of BCI.

About the authors

VF F Pyatin

Samara State Medical University

Email: pyatin_vf@list.ru
hD, professor, Head of the Department of Physiology with the course of life safety and medicine of catastrophes SSMU, Head of the Department of Neurointerface and Applied Neurophysiology of the Center for breakthrough research «IT in Medicine» Russia, 443081. ap. 85, 59 Fadeev st., Samara

AV V Kolsanov

Samara State Medical University

Email: avkolsanov@mail.ru
PhD, professor, director of the Institute of innovative development of Samara State Medical University Russia, 443081. ap. 85, 59 Fadeev st., Samara

MS S Segreeva

Samara State Medical University

Email: marsergr@yandex.ru
PhD, associate professor of the Department of Physiology with the course of life safety and medicine of catastrophes SSMU, Head of the Laboratory of Applied Neurophysiology of the Center for breakthrough research «IT in Medicine Russia, 443081. ap. 85, 59 Fadeev st., Samara

ES S Korovina

Samara State Medical University

Email: korovina_ekateri@mail.ru
postgraduate student at the Department of Physiology with the course of life safety and medicine of catastrophes Russia, 443081. ap. 85, 59 Fadeev st., Samara

AV V Zakharov

Samara State Medical University

Email: zakharov1977@mail.ru
PhD, associate professor of the Department of Neurology and Neurosurgery, Head of the Laboratory of Neurointerface of the Center for breakthrough research «IT in Medicine» Russia, 443081. ap. 85, 59 Fadeev st., Samara

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Copyright (c) 2016 Pyatin V.F., Kolsanov A.V., Segreeva M.S., Korovina E.S., Zakharov A.V.

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