Dear Ravish, seizure features can vary between patient and between types of seizures; you may want to look at seizure detection literature from specific features.
In intracerebral EEG, a classical pattern that is observed is the 'flattening' of traces, with a pronounced decrease of low frequencies and increase in high frequency content (see Bartolomei et al Brain 2008); but this is not the only pattern, other may involve slow waves at seizure onset (see Lagarde et al Epilepsia 2016).
An important consideration when the pattern involves sharp epileptic spikes is that spikes are not band limited; in other words they spread across several band - the description in bands is then less appropriate (see Benar et al CLin Neurophysiol 2010, Jmail et al Physiol Meas in press, see also Courtens et al Brain Connect 2016 for preictal spiking patterns).
Another consideration of course when dealing with surface EEG is the presence of movement and muscle artefacts (see Vergult et al Epilepsia 2007 for denoising). Despite this, good results have been obtained on source localization (Koessler et al Neuromiage 2010).
Hope this help
Best regards,
Christian
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