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Photo-stimulation effect on the human EEG alpha-wave spectrum

Author(s): Ryozo Aoki | Yasuyuki Sonezaki | Tahei Kitamura | Kazuhiro Satoh

Journal: World Journal of Neuroscience
ISSN 2162-2000

Volume: 03;
Issue: 03;
Start page: 131;
Date: 2013;
Original page

Keywords: EEG | Alpha-Wave | Frequency Spectrum | Light Flashing Stimulation | Chaotic Dynamics | Spectrum Entrainment

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.
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