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Hippocampal seizure with progressive involvement of neocortical temporal areas (spectral analysis)

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32-channel stereoelectroencephalographic referential recording of a spontaneous hippocampal onset seizure. The recording from the left hippocampus (inner contacts of depth electrode 2 = channel 5) is enlarged at the top of the figure. Spectral analysis of the 32 channels is shown at right for 4 time windows (1, 5, 7, and 9). Note the anatomical position of the 8 depth electrodes. The contacts recorded are numbered in the Talairach schema and are arranged from top-left to right-bottom in the power spectra maps (frequency 0 to 30 Hz). Note the clear-cut power maximum in the channel 5 recording from the left hippocampus with progressive involvement of the outer contacts of depth electrodes 3 and 4 in window 9. (Contributed by Dr. Heinz Gregor Wieser.)