Image of the Day

The images that appear in the "Image of the Day" are selected for the freshness of their views on Brain Mapping, their esthetic appeal, their quirkiness, or someimes just to prod you into thinking about the field and its context. Their appearance here is not an endorsement of their subject matter.

Nonlinear EEG Analysis of Epilepsy Patients Epilepsy manifests itself not only in visible seizures, but also in characteristic patterns in the electroencephalogram (EEG). It is thus an important field of application for modern methods of nonlinear time series analysis. In collaboration with the Department of Epileptology at the University of Bonn, we are pursuing two main aims. On the one hand, we develop methods for localizing epileptic foci in patients who are possible candidates for surgery. The figure shows regions with elevated (green) and high (red) likelihood of being a focus in a retrospective analysis. Also shown is the region which has actually been removed, based on other analyses (black). In the case illustrated, the primary focus had been correctly recognized and removed, and the patient is now free of seizures. An advantage of our method over previous ones is that it uses only data from seizure-free epochs, and that their predictions do not always agree with those of other methods. In some rare cases where the patient is not completely free of seizures, our analysis would suggest that there is indeed a secondary focus or that the primary focus has not been removed entirely.

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Submitted by: Mark Cohen