| 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. |