Which EEG change is most likely to be observed in the postictal state?

In the postictal state, the most likely EEG change observed is delta activity in the region of seizure origin. This phase occurs after a seizure has ended, and it is common for the brain to reflect a state of recovery. Delta waves, which indicate a slow and synchronous brain activity, are typically prominent in the area where the seizure originated due to residual effects after the ictal period.

These delta waves often signify impaired cerebral functioning and a recovery process following a period of hyperexcitability during the seizure. The presence of delta activity indicates the brain's response as it attempts to return to its baseline state. Recognizing this pattern is crucial for clinicians monitoring patients post-seizure, as it can provide insight into the seizure's characteristics and potential recovery trajectory.

In contrast, high frequency oscillations are more associated with the active phases of seizures rather than the postictal recovery phase. A flat EEG baseline would suggest a complete lack of brain activity, which is not typical for the postictal state as some residual activity is usually present. Theta rhythm is seen in various states including drowsiness or light sleep rather than specifically postictally, where delta activity is more characteristic. Thus, delta activity aligns well with the physiological changes that occur after