Which statement about absence seizures is true?

• A. They involve brief impairment of awareness with staring and a characteristic 3 Hz spike-and-wave EEG pattern.
• B. They always involve convulsive activity.
• C. They last several minutes and have a clear postictal state.
• D. They originate from the temporal lobe with automatisms.

Answer: (A)

Absence seizures are brief, generalized lapses of consciousness. The hallmark is a sudden, brief stare with subtle ongoing movements or automatisms such as lip movements or eye flutter, reflecting a temporary impairment of awareness. The defining feature is the EEG pattern during these events: a generalized spike-and-wave discharge at about 3 Hz. This specific 3 Hz pattern is characteristic and helps distinguish absence seizures from other seizure types.

Because they are generalized, absence seizures do not involve convulsive activity. They are typically very short, lasting only a few seconds, and there is usually no postictal confusion or prolonged recovery afterward. They do not originate from the temporal lobe; instead, they arise from thalamocortical networks that produce the 3 Hz spike-and-wave activity. This combination of brief impairment of awareness with a 3 Hz spike-and-wave EEG pattern is what makes the statement true, while features like convulsions, longer duration with postictal states, or temporal lobe origin point to other seizure types.