Spatio-temporal Aspect of Entrainment in Alpha Wave Induced by Periodic Light Stimulus in Human Brain.

概要

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We study Spatio-temporal dynamics of the entrainment of brain waves. The entrainment is induced by an external photo-stimulus to the eyes with a periodic frequency, close to the frequency of the alpha wave. It certainly suggests for an origin of the wave to be a nonlinear oscillator. Dealing with the spatio-ternporal characteristics of such nonlinear oscillators based on entrainment dynamics, we propose a new method by a normalized entrainment map in space. By the use of this method, the following facts are clarified: (1) The frequency range of the entrainment in sinciput is broader than that in occiput; (2) The stronger entrainment by the stimulus is observed for the narrower bandwidth of the alpha peak in the stimulus-free spectrum (the so-called single peak spectrum); and (3) The wider the entrainment, the broader the spectrum in a stimulus-free case (the so-called multipeaks spectrum). These results clearly show that the new method may be useful in understanding the characteristic of the dynamics of the alpha wave as nonlinear oscillator systems.
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