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Seizures: Classification

Seizures: Classification

Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:

Seizures ll: Types

Seizures ll: Types

Seizures are sudden bursts of abnormal electrical discharge in the brain that interfere with normal function. They are commonly divided into three groups: focal seizures, generalized seizures, and other types that do not fit neatly into either category.Focal SeizuresFocal seizures begin in a single brain region. When awareness is preserved, they are called focal aware seizures and may cause sensations such as tingling, unusual smells, or flashing lights. When awareness is impaired, they are...

Epilepsy and Seizures: Overview

Epilepsy and Seizures: Overview

Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...

Biological Influences on Intelligence

Biological Influences on Intelligence

Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...

Seizures l: Introduction

Seizures l: Introduction

Understanding seizures and epilepsy relies on key definitions that help in recognizing, classifying, and managing these disorders. These definitions provide a framework for recognizing, classifying, and managing seizure disorders.DefinitionsA seizure is a sudden, abnormal burst of electrical activity in the brain that can cause changes in awareness, movement, sensation, or behavior, depending on the area involved. Epilepsy is a chronic condition characterized by recurrent, unprovoked seizures,...

Epilepsy ll: Types

Epilepsy ll: Types

Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.

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Related Experiment Video

Updated: Jun 1, 2026

Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy

Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy

Published on: September 20, 2024

Intelligence and cortical thickness in children with complex partial seizures.

Duygu Tosun¹, Rochelle Caplan, Prabha Siddarth

¹Center for Imaging of Neurodegenerative Diseases, San Francisco, CA, USA. duygu.tosun@ucsf.edu

|May 19, 2011

Summary

Children with epilepsy show altered brain development related to intelligence. Specifically, disruptions in cortical thickness patterns are linked to intelligence quotient (IQ) in pediatric patients with complex partial seizures (CPS).

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Cortical Source Analysis of High-Density EEG Recordings in Children

Cortical Source Analysis of High-Density EEG Recordings in Children

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Last Updated: Jun 1, 2026

Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy

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Frontal Disconnection for Treating Mild Malformation of Cortical Development with Oligodendroglial Hyperplasia in Epilepsy (MOGHE) in the Frontal Lobe

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Published on: August 16, 2024

Cortical Source Analysis of High-Density EEG Recordings in Children

Cortical Source Analysis of High-Density EEG Recordings in Children

Published on: June 30, 2014

Area of Science:

Neuroscience
Pediatric Neurology
Developmental Neuroscience

Background:

Previous research highlights regional variations in intelligence and cerebral tissue in healthy children.
Limited data exists on neuroanatomical correlates of general intelligence in children with epilepsy compared to controls.
Advanced in vivo imaging and analysis techniques can map brain development and abnormalities in childhood epilepsy.

Purpose of the Study:

To investigate the relationship between cortical thickness, age, and intelligence quotient (IQ) in children with complex partial seizures (CPS) and healthy controls.
To compare age-related patterns of cortical thickness between pediatric epilepsy patients and controls across different IQ levels.

Main Methods:

Utilized a surface-based, computational high-resolution 3-D magnetic resonance imaging (MRI) analysis.
Compared 65 children and adolescents with CPS and 58 healthy controls (aged 6-18 years).
Grouped participants by health status (epilepsy vs. controls) and IQ level (average/above vs. below average).

Main Results:

Identified disruptions in normal age-related cortical thickness expression in pediatric CPS patients.
These disruptions were associated with intelligence levels in both average and below-average IQ groups.
Findings suggest a link between altered brain structure and cognitive function in childhood epilepsy.

Conclusions:

Abnormal age-related cortical thickness patterns are associated with intelligence in pediatric patients with complex partial seizures.
This study provides insights into the neuroanatomical underpinnings of intelligence variations in childhood epilepsy.
Further research is warranted to explore the implications of these findings for understanding and managing epilepsy.