Frequency‐Dependent EEG Corresponding to EMG under Voluntary Movement

The brain‐machine interface was studied using electroencephalography (EEG) to extract relevant signals of body movement. We aimed to correlate the motor command in EEG and muscle movement represented by electromyography (EMG) using a time series of each signal. Corresponding components of muscle movement to the brain wave spectrogram representing a motor command are sought through comparison of the EMG power envelope and the wavelet‐processed EEG. Results showed that the timing and peak of event‐related EEG power corresponds to the EMG power envelope in a high‐γ bandwidth (55 to 63 Hz) at the primary motor cortex (C3), indicative of phase‐dependent EEG–EMG connection. Such timing and phase coincidence between EEG and EMG suggests event‐related synchronization in the primary motor cortex serving as a motor command that initiates muscle activity. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.