Chaos Theory Analysis of an Electroencephalogram and Pulse Wave Changes by Imagery

The purpose of the present work was to investigate the effects of visual imagery, e.g. meditation, at meridian points on an electroencephalogram and pulse waves by chaos theory analysis. Imagery visualization of a sunlight incident at Dantian, Danzhong and Yingtang and of filling a body with sunlight showed a slowing electroencephalogram over the whole region during the imagery. A remarkable increase of theta waves and alpha1-waves was observed for a certain subject. In addition, a decrease of the pulse interval and an increase of the intensity of pulse waves were observed upon imagery. Chaos theory analysis showed that the Lyapunov exponent and entropy of brain waves increased during the imagery, and that the Lyapunov exponent of pulse waves decreased. The present results indicated that the visual imagery promoted the neurochaos phenomenon based on the neuron activity and parasympathetic-division activity.