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Interictal, Preictal, and Postictal Periods in Canine iEEG Recording. Interictal segments are taken at least one week prior to a seizure event. Interictal periods are treated as baseline. Preictal periods are the periods of time prior to a seizure, with a 5-minute horizon used as a test of validity. The ictal (seizure) period (marked in red) has a variable length, while the postictal period is characterized by synchronous slow-wave activity following termination of the seizure.
