What is a common EEG finding during a seizure?

A common finding during a seizure in an electroencephalogram (EEG) is the presence of spike and wave patterns. These patterns are characterized by sharp spikes followed by slow waves, often indicating abnormal electrical activity in the brain associated with seizures. This pattern can be particularly prominent in certain types of seizures, such as absence seizures, and reflects the dysregulation of neuronal firing.

Alpha waves typically represent a calm, resting state of the brain and are not associated with seizure activity. Beta waves are related to alertness and active concentration, but again, do not typically appear during seizure events. Delta waves, which are slow brain waves, can occur in various states, including deep sleep or brain injury, but they are not specifically indicative of seizures. Therefore, spike and wave patterns are the most relevant EEG findings during seizure activity, highlighting the abnormal neuronal excitability present during such events.