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EEG Attractor for Olfactory Bulb of Rat in Seizure
An EEG trace from the olfactory system of the brain of a rat, during an epileptic seizure. The trajectory of a point moving through this space in time traces the subspace that is occupied by a strange attractor. We have colored it red when the fourth variable is negative and blue-white when it is positive. The Hausdorff dimension is reduced to 2.52, and the structure of the strange attractor appears to be that of a 2-torus.

Walter J. Freeman
Freeman: Strange Attractors that Govern Mammalian Brain Dynamics
IEEE Transactions on Circuits and Systems, Vol. 35, No. 7, July 1988