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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Rev Neurol (Paris). 2015 Feb 25;171(3):236–251. doi: 10.1016/j.neurol.2015.01.563

Figure 8.

Figure 8

Preictal discharges progressively emerge during the transition to the seizure.

A: Extracellular recordings of the transition to seizure-like activity. E1 and E2 are recordings from two subicular electrodes. MUA frequency (upper trace) and the extracellular signal from E2 (lower trace) are shown.

B: Amplitude measurements for all field potentials recorded by electrode E2 during the transition show the emergence of larger PIDs, whereas the amplitude of inter-ictal events did not change.

C: Dual extracellular recordings showing IIDs (open circles, left) before convulsant application and coexpression of PIDs (filled circles, right) with IIDs during the transition.

D: Amplitude distribution for all field potentials during the 35-min transition period showed IIDs of amplitude 10–50 μV and PIDs of amplitude 125–175 μV.