Forma, Vol. 6 (No. 3), pp. 205-214, 1991
Original Paper

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.