EEG real-time feedback based on STFT and coherence analysis

A method and system of real-time feedback and analyzing Electroencephalogram (EEG) using short-time Fourier transform (STFT) and coherence analysis is presented in this paper. The system composition of hardware and software are described. By the utilization of this method and system, the EEG´s real-time time-frequency distribution (TFD) is obtained, and the EEG temporal spectral 3-dimension array is displayed on computer´s screen for EEG realtime feedback. The time-frequency analysis (TFA) such as Wigner-Ville distribution (WVT) and wavelet transform (WT), has been successfully applied in some biomedical signals to detect both temporal and spectral features of biomedical signals. But real-time realization of TFA is difficult since the computation complication of WVT and WT. By using the STFT algorithm, we develop a system for the EEG feedback and TFA in real-time. This system may be used for EEG biofeedback, and possesses the value of clinical practice.