This paper gives the main results of our studies of information transmission in the human cerebral cortex. The analysis is based on the mutual information theory of Vastano and Swinney (1988). We recorded eight-channel electroencephalographs (EEGs). The information transmission between these eight leads was computed. The transmission intensities were characterized by complexity measures. The complexity measures are: the algorithm complexity of Kolmogorov (1965), C 1 complexity and C 2 complexity. The last two were defined by us in a previous paper (Xu et al., 1994).