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Related Concept Videos

Seizures l: Introduction01:20

Seizures l: Introduction

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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,...
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Epilepsy ll: Types01:22

Epilepsy ll: Types

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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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Seizures ll: Types01:19

Seizures ll: Types

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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...
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Seizures: Classification01:13

Seizures: Classification

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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:
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Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

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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...
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Electroconvulsive Therapy01:30

Electroconvulsive Therapy

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Electroconvulsive therapy (ECT), or shock therapy, remains a critical biomedical intervention for severe, treatment-resistant depression. While its origins can be traced back to Hippocrates' observations that malaria-induced convulsions alleviated mental illness, modern ECT has evolved significantly from its earlier, more primitive applications. First introduced in 1938 by Ugo Cerletti and his colleagues, ECT involves inducing controlled seizures using electrical currents. In its early...
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Updated: Apr 20, 2026

Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
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The temporal crescent syndrome.

Khalid Ali

    Practical Neurology
    |November 23, 2014
    PubMed
    Summary
    This summary is machine-generated.

    A rare neurological condition, temporal crescent syndrome, causes monocular visual field defects. This case report details a patient with seizures and subsequent right-sided visual disturbance due to a parieto-occipital sulcus lesion.

    Keywords:
    BRAIN MAPPINGCLINICAL NEUROLOGYEPILEPSYNEUROOPHTHALMOLOGYVISION

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    Area of Science:

    • Neuro-ophthalmology
    • Neurology

    Background:

    • Retro-chiasmal lesions typically cause homonymous visual field defects.
    • The nasal visual field has a temporal crescent representation in the contralateral anterior parieto-occipital sulcus.

    Observation:

    • A patient presented with seizures due to hemorrhagic infarction in the anterior parieto-occipital sulcus.
    • Following the infarction, the patient developed a right-sided visual disturbance.

    Findings:

    • Examination confirmed the presence of temporal crescent syndrome, a rare monocular visual field defect.
    • This syndrome results from lesions affecting the anterior parieto-occipital sulcus.

    Implications:

    • This case highlights the pathophysiology of temporal crescent syndrome.
    • Understanding this rare condition is crucial for accurate diagnosis and management of visual field defects.