COVER ILLUSTRATION. Preictal changes in EEG dynamics are evidenced by non-linear analysis (middle), but not by spectral analysis (top). The statistical significance of these changes is depicted for each scalp EEG channel (bottom). Horizontal black arrow span = reference; horizontal red arrow span = anticipation time; vertical black arrow = seizure. From `Seizure anticipation in human neocortical partial epilepsy' by V.Navarro et al., pp. 640-655.