Nonlinear Entrainment and Stochastic Resonance in Brain waves

The human brain is certainly a complex system consisting of many cells and synaps with successive hierarchy of these elements. The brain waves, such as alpha, betha and so on, result from activities of these structures and show quite rich varieties in space and time. Such nonlinear oscillators consist of subgroups of those elements in the brain and show another hierarchy, some periodicities and chaos. Applying external stimuli such as a periodic light illumination and sound, brain waves are entrained and sometimes stochastic resonance is observed. Here we especially concentrate on the alpha wave and have found a very sharp entariment by external stimuli. The entrainment induces strong unpleasant for a test subject. We are studying the mechanism and dynamics in the human brain from viewpoint of nonlinear dynamics as a complex system.






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