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Intelligent Engineering Systems Through Artificial Neural Networks, Volume 17

C. H. Dagli
C. H. Dagli
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Coordination of neural oscillations generated at different frequencies has been conjectured to be an important feature of neural activity. In this paper we investigate the phenomena of phase synchronization in electroencephalogram mesoscopic arrays. The electrical activity of the neurons in the visual cortex of rabbits is recorded and analyzed. An 8*8 array of electrodes is placed on the visual cortex of the subject. We consider each electrode as a variable in the phase space of a dynamical system. We decompose each variable in the phase space into narrow frequency signals using finite impulse filters according to standard clinical bands. We measure the instantaneous amplitude and phase of each electrode signal using the continuous time analytical signal concept. We conjecture that the dynamics of the visual cortex can be considered a metastable system with periods of absolute and relative synchronization.

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