Brief events of abnormal electrical activity in nerve cells of the brain

• A. Convulsion
• B. Epilepsy
• C. Seizure
• D. Myoclonus

Answer: (C)

A seizure is a sudden, brief episode of abnormal electrical activity in the brain’s neurons. This definition fits because it focuses on the transient disruption of normal electrical firing in the brain, which can produce a wide range of symptoms depending on where it starts and how it spreads.

Convulsions describe the motor activity that can occur during some seizures, especially generalized ones, but not all seizures involve visible convulsions. Epilepsy is a chronic condition defined by recurrent unprovoked seizures, not a single event. Myoclonus refers to sudden brief muscle jerks and can occur with seizures or on its own, but it does not capture the broader brain-wide electrical disturbance that seizures describe. Therefore, the best answer is a seizure.