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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 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,...

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...

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.

Narcolepsy

Narcolepsy

Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.

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Related Experiment Video

Updated: Jul 9, 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

Psychogenic nonepileptic seizures.

Laurence M Binder¹, Martin C Salinsky

¹Oregon Health and Science University, Portland, OR, USA. pdxlarry@aol.com

Neuropsychology Review

|November 29, 2007

Summary

This summary is machine-generated.

This review covers the neurological and neuropsychological features of psychogenic nonepileptic seizures (PNES). It examines psychosocial, psychiatric, cognitive, and MMPI-2 findings to better understand PNES.

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Area of Science:

Neurology
Neuropsychology
Psychiatry

Background:

Psychogenic nonepileptic seizures (PNES) are a complex neurological disorder with significant psychiatric and psychosocial components.
Understanding the multifaceted nature of PNES is crucial for accurate diagnosis and effective treatment.

Purpose of the Study:

To provide a comprehensive review of the neurological, neurodiagnostic, and neuropsychological aspects of PNES.
To synthesize current knowledge on psychosocial, psychiatric, cognitive, and MMPI-2 findings related to PNES.

Main Methods:

Literature review of neurological, neurodiagnostic, and neuropsychological studies on PNES.
Analysis of research focusing on psychosocial, psychiatric, cognitive, and MMPI-2 assessments in PNES patients.

Main Results:

PNES presents with diverse neurological and neurodiagnostic characteristics.
Significant psychosocial stressors, psychiatric comorbidities, and specific cognitive patterns are frequently observed in individuals with PNES.
MMPI-2 results often indicate particular psychological profiles relevant to PNES.

Conclusions:

PNES requires an integrated approach considering neurological, psychological, and social factors.
Neuropsychological assessments, including MMPI-2, offer valuable insights into the underlying mechanisms and management of PNES.