Before revision:  Importantly, we find that a combination of fluctuations on different timescales can explain the changes in seizure evolution in most patients above chance-level. We interpret these results as evidence that seizure modulating factors exist, and they vary over time (patient-specifically). These time-varying modulating factors can be captured in fluctuations of EEG band power , and future work should link them to the exact biological time-varying processes  .
After revision:  Importantly, we find that a combination of fluctuations on different timescales can explain the changes in seizure network evolution in a regression model in most subjects above chance level. These results suggest that subject-specific fluctuations in iEEG band power over timescales of minutes to days are associated with how seizures are modulated over time. Future work is needed to link the detected fluctuations to the exact biological time-varying processes .