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Related Concept Videos

Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...
Epilepsy and Seizures: Overview01:24

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...
Seizures: Classification01:13

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: Introduction01:20

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: Types01:19

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 ll: Types01:22

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: Jul 18, 2026

Non-restraining EEG Radiotelemetry: Epidural and Deep Intracerebral Stereotaxic EEG Electrode Placement
06:58

Non-restraining EEG Radiotelemetry: Epidural and Deep Intracerebral Stereotaxic EEG Electrode Placement

Published on: June 25, 2016

Sensory Jacksonian seizures

R A Lende, A J Popp

    Journal of Neurosurgery
    |June 1, 1976
    PubMed
    Summary

    Sensory Jacksonian seizures often begin peripherally, not centrally, and spread across the cortex in organized patterns. These seizure patterns resemble chimpanzee somatosensory maps, suggesting specific cortical pathways are involved.

    Area of Science:

    • Neurology
    • Neuroscience
    • Epilepsy Research

    Background:

    • Sensory Jacksonian seizures are a type of focal epilepsy.
    • Understanding their origin and progression is crucial for diagnosis and treatment.

    Purpose of the Study:

    • To analyze the anatomical and temporal sequences of sensory Jacksonian seizures.
    • To compare seizure progression patterns with known cortical somatosensory maps.

    Main Methods:

    • Analysis of seizure patterns in 42 patients with sensory Jacksonian seizures.
    • Comparison of observed seizure spread with established somatosensory cortical maps.

    Main Results:

    • Sensory Jacksonian seizures frequently originate in peripheral locations with minimal initial cortical representation.

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    Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale
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    Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale

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    Last Updated: Jul 18, 2026

    Non-restraining EEG Radiotelemetry: Epidural and Deep Intracerebral Stereotaxic EEG Electrode Placement
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    Published on: June 25, 2016

    Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy
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    Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale
    07:35

    Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale

    Published on: July 8, 2025

  • Seizure progression follows an organized, non-random pattern involving functionally coherent cortical units.
  • Observed patterns more closely align with chimpanzee somatosensory maps than human maps.

    • Conclusions:

    • Sensory Jacksonian seizures exhibit distinct origin and progression patterns compared to motor seizures.
    • The findings suggest specific, organized cortical pathways are involved in sensory seizure propagation.
    • Complete diagnostic evaluation is essential for patients with sensory Jacksonian seizures due to potential focal pathology.