Walter Freeman studied the olfactory sense of rabbits, using EEG data to reconstruct a picture of the dynamical attractor of familiar scents. The attractor has fractal characteristics, and this may provide an explanation for preattentive perception, the recognition of familiar stimuli when only a portion of the stimuli have been processed.
Agnes Babloyantz used similar methodologies to study brain states during different stages of sleep.
P. A. Watters used sophisticated statistical tests to detrend EEG data, and obtained results suggesting EEG are fractal processes with long-range time correlations.