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Figure 3: Ictal baseline shifts (IBSs). Selected subdural contacts over the lateral temporal (LG), anterior inferomesial temporal (AT and MT) and posterior inferomesial temporal (PT) regions in the same patient as in Figure 1 are shown. At the infraslow setting of 0.016-30 Hz and 30 s per page window, seizure onsets defined by high frequency oscillations (HFO onset) and conventional frequency activity (CFA onset) are shown along with the earliest clinical change (clinical onset). HFO onset was defined in the AT channels, whereas CFA onset was defined in the PT and MT channels. Prominent negative and positive IBSs are seen at or after the CFA seizure onset in a widespread distribution. However, careful inspection shows smaller but distinct IBSs at the time of HFO seizure onset in a restricted distribution involving only three contacts (AT3, AT4 and MT4). Note that a referential montage with an average reference is used

Figure 3: Ictal baseline shifts (IBSs). Selected subdural contacts over the lateral temporal (LG), anterior inferomesial temporal (AT and MT) and posterior inferomesial temporal (PT) regions in the same patient as in Figure 1 are shown. At the infraslow setting of 0.016-30 Hz and 30 s per page window, seizure onsets defined by high frequency oscillations (HFO onset) and conventional frequency activity (CFA onset) are shown along with the earliest clinical change (clinical onset). HFO onset was defined in the AT channels, whereas CFA onset was defined in the PT and MT channels. Prominent negative and positive IBSs are seen at or after the CFA seizure onset in a widespread distribution. However, careful inspection shows smaller but distinct IBSs at the time of HFO seizure onset in a restricted distribution involving only three contacts (AT3, AT4 and MT4). Note that a referential montage with an average reference is used