Seizure Disorder
A neurological condition characterised by a tendency toward recurrent, unprovoked seizures caused by abnormal, excessive electrical activity in the brain.
Epilepsy is diagnosed when someone has a tendency toward recurring, unprovoked seizures - episodes of abnormal, excessive, or synchronised electrical activity among neurons that temporarily disrupts normal brain function. Seizures vary enormously in how they present, from brief staring "absence" episodes to dramatic convulsions, largely depending on where in the brain the abnormal activity starts and how far it spreads.
The temporal lobe is the most common site of origin for focal seizures in adults, giving rise to temporal lobe epilepsy. Seizures can also originate in the frontal lobe, and the thalamus is thought to play a central role in generalised absence seizures through abnormal thalamocortical rhythms. In severe, treatment-resistant cases, surgically severing the corpus callosum (a callosotomy) has historically been used to prevent seizures from spreading between hemispheres.
Most people with epilepsy achieve good seizure control with anti-seizure medications, and research continues to develop options with fewer side effects. For medication-resistant epilepsy, precise brain mapping (building on techniques pioneered by researchers like Wilder Penfield) now allows surgeons to identify and, where safe, remove or disconnect a specific seizure-origin area. Responsive neurostimulation devices, which detect abnormal activity and deliver a corrective electrical pulse in real time, represent a newer, less invasive direction for treatment-resistant cases.
This article is for general education and isn't a substitute for professional medical advice or diagnosis.
Explore the regions involved in epilepsy in more depth:
