What characterizes a generalized seizure?

A generalized seizure is characterized by seizure activity that affects both hemispheres of the brain, leading to a range of symptoms. The correct choice highlights that severe twitching of all muscles, also known as a generalized tonic-clonic seizure, can occur. In this type of seizure, individuals may experience intense muscle contractions and a loss of consciousness.

This type of seizure is distinct from other forms, which might only affect one part of the body or involve different manifestations such as absence seizures, characterized by brief lapses in consciousness. The other options provided do not define generalized seizures accurately. Elevated body temperature is not specific to seizures and could indicate other medical conditions. A blank stare with brief loss of consciousness refers more to absence seizures rather than generalized ones. Lastly, unconsciousness for longer than 30 minutes aligns with a medical emergency known as status epilepticus, rather than the typical characteristics seen in generalized seizures.