Fractal Dimensionality of Brain Wave

Yoshiya Shinagawa¹, Kimiko Kawano², Hiroyuki Matsuda³, Hiromi Seno², and Hidemi Koito²

¹Department of Physiology, Nippon Medical School, Tokyo 113, Japan
²Information Processing Center of Medical Sciences, Nippon Medical School, Tokyo 113, Japan
³National Research Institute of Fisheries Science, Marine Bioecology Division, Tokyo 104, Japan

(Received March 16, 1991; Accepted April 22, 1991)

Keywords: Fractal Dimensions, Brain Wave

Abstract. Fractal natures of brain wave, that is of electroencephalogram (EEG), are investigated, made use of some fractal dimensionalities of it. Especially as for EEG with a-wave, those of frontal and occipital region are compared with respect of the fractal dimension. Significant difference of those dimensions gives such a conjecture that those EEGs with (a-wave are independently created. It is indicated that EEG can be modelled by a deterministic dynamical system with a chaotic nature.