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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: Epilepsia. 2008 Jun 26;49(11):1925–1940. doi: 10.1111/j.1528-1167.2008.01707.x

Fig. 3. Progressive involvement and variability of synchronous patterns during fast runs.

Fig. 3

A. Seven depth-EEG recordings were obtained from suprasylvian gyrus with inter-electrode distance of 1.5 mm. The seizure started with the runs of fast spikes recorded with electrode 7 (most anterior), the other electrodes reveal a progressive involvement of suprasylvian gyrus in the fast run. After several spike-wave/polyspike-wave complexes, the next period of fast runs was accompanied with perfect synchrony over suprasylvian gyrus. At the end of the seizure, the oscillatory activity with frequency around 10 Hz was found at electrode 1 and progressively declined to the electrode 7. B. Correlation analysis. Cross-correlations were obtained from periods of 2 seconds as indicated by horizontal bars and numbers in the panel A. Electrode 7 was taken as reference. At the beginning (1) and at the end (4) of seizure, the correlation between anterior and posterior electrodes was low. During periods indicated as 2 and 3 the correlation between different electrodes was high; the activity was propagating, but the propagation occurred in two different directions.