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For posterity's sake, a bispectrum of an EEG signal is defined precisely in the paper the author linked in the comment to their question. Bispectrum has the following definition: References Zhou, S. M., Gan, J. Q., & Sepulveda, F. (2004). Using higher-order statistics from EEG signals for developing brain-computer interface (BCI) systems. In ...


A study by D’Zmura et al. (2009) in which two syllables were spoken in imagination showed that imagined speech information was present in EEG alpha, beta and theta bands. The beta band (13-18 Hz) proved most informative. The most informative electrodes were located mainly near the top of the head (vertex) where electromyographic artifacts had least ...

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