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Time-frequency analysis of EEG signals evoked by voluntary, stimulated and imaginary motions

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Abstract

In order to investigate the characteristics of sensorimotor cortex during motor execution (ME), voluntary, stimulated and imaginary finger flexions were performed by ten volunteer subjects. Electroencephalogram (EEG) data were recorded according to the modified 10–20 International EEG System. The patterns were compared by the analysis of the motion-evoked EEG signals focusing on the contralateral (C3) and ipsilateral (C4) channels for hemispheric differences. The EEG energy distributions at alpha (8–13 Hz), beta (14–30 Hz) and gamma (30–50 Hz) bands were computed by wavelet transform (WT) and compared by the analysis of variance (ANOVA). The timefrequency (TF) analysis indicated that there existed a contralateral dominance of alpha post-movement event-related synchronization (ERS) pattern during the voluntary task, and that the energy of alpha band increased in the ipsilateral area during the stimulated (median nerve of wrist) task. Besides, the contralateral alpha and beta event-related desynchronization (ERD) patterns were observed in both stimulated and imaginary tasks. Another significant difference was found in the mean power values of gamma band(p<0.01)between the imaginary and other tasks. The results show that significant hemispheric differences such as alpha and beta band EEG energy distributions and TF changing phenomena (ERS/ERD) were found between C3 and C4 areas during all of the three patterns. The largest energy distribution was always at the alpha band for each task.

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Authors and Affiliations

  1. Tianjin Key Laboratory of Biomedical Detecting Techniques and Instruments, School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China

    Dong Ming  (明 东), Nannan Li  (李南南), Anshuang Fu  (付安爽), Rui Xu  (徐 瑞), Shuang Qiu  (邱 爽), Qiang Xu  (徐 强), Peng Zhou  (周 鹏), Lixin Zhang  (张力新) & Baikun Wan  (万柏坤)

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  1. Dong Ming  (明 东)
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  2. Nannan Li  (李南南)
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  3. Anshuang Fu  (付安爽)
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  4. Rui Xu  (徐 瑞)
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  5. Shuang Qiu  (邱 爽)
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  6. Qiang Xu  (徐 强)
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  7. Peng Zhou  (周 鹏)
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  8. Lixin Zhang  (张力新)
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  9. Baikun Wan  (万柏坤)
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Corresponding author

Correspondence to Dong Ming  (明 东).

Additional information

Supported by the National Natural Science Foundation of China (No. 81222021, No. 61172008, No. 81171423), National Key Technology Research and Development Program of the Ministry of Science and Technology of China (No. 2012BAI34B02) and Program for New Century Excellent Talents in University of the Ministry of Education of China (No. NCET-10-0618).

Ming Dong, born in 1976, male, Dr, Prof.

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Ming, D., Li, N., Fu, A. et al. Time-frequency analysis of EEG signals evoked by voluntary, stimulated and imaginary motions. Trans. Tianjin Univ. 20, 210–214 (2014). https://doi.org/10.1007/s12209-014-2180-3

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  • DOI: https://doi.org/10.1007/s12209-014-2180-3

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