Recently, a number of studies have shown that EEG recordings also carry important information minutes prior to the seizure onset to distinguish between preictal
and interictal states [3-15].
After training, the classifier should be able to classify and estimate the preictal
Although, compared to interictal spikes, HFOs were found to show a higher level of correlation with seizures and expose a more stable localisation, assessed ictally versus interictally , and their suitability as a predictive marker in the preictal
period could not be confirmed .
Epileptic seizures have four different states: the preictal
state, which is a state that appears before the seizure begins, the ictal state that begins with the onset of the seizure and ends with an attack, the postictal state that starts after ictal state, and interictal state that starts after the postictal state of 1st seizure and ends before the start of preictal
state of consecutive seizure.
EEG signals are divided into preictal
, ictal, and postictal sessions accordingly.
Rubboli, "Permutation entropy to detect vigilance changes and preictal
states from scalp EEG in epileptic patients--a preliminary study," Neurological Sciences, vol.
Using 5 Hz trains of repetitive TMS, the impaired homeostatic plasticity has been reported in individuals with episodic migraine during the preictal
and postictal stages of the migraine cycle .
Hence, the transition from preictal
to ictal state for an epileptic seizure contains a gradual change from a chaotic to ordered wave forms.
Three minutes preictal
and 10 min interictal ECoG as recorded in 39 channels in the SOZ and 256 channels in the NSOZ were analyzed.
EMU nurses also help to prevent preictal
(before the seizure), intraictal (during a seizure), and postictal (after a seizure) complications.
Also, spatiotemporal changes in preictal
spike activity in human temporal lobe epilepsy  revealed that the degree of bilateral interdependence in medial temporal lobe spike activity increased prior to onset of a seizure, thus indicating that spikes may herald the interictal to ictal transition.
applied PE to detect vigilance changes and the preictal
phase from scalp EEG in three epileptic patients .