The EEG α wave mode shows chaotic characters and the frequency spectrum is entrained to
the external photo-stimulation peak. This effect was observed exceedingly in
the photo-sensitive children as compared with
the normal adults. The α spectrum
shows asymmetric components with
lower frequency-side tail. This spectrum shape could be realized from
the computation in terms of the McCulloch-Pitts model and presented in
comparison with the observed result. From this analysis, it turns out that the
frequency spectrum analysis is most essential for the investigation of the EEG
characteristics in comparison with simple waveform
inspections in the time-passage. When light flashing frequencies come
close to the alpha peak, the both peaks are fused in a giant single peak. These
phenomena cannot be understood by the simple
mechanical resonant theory but as discussed from the viewpoint of the
soft chaotic dynamics of the neural network. Here the both peak intensities Iα and Iex are
investigated under different conditions of ωex < ωα, and ωα < ωex, and it is shown that the entrainment effect is
remarkably different in both cases. This result can be understood from the
relating neuronal numbers and discussed.
Cite this paper
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