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Related Concept Videos

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 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...
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.
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...

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Related Experiment Video

Updated: Jun 1, 2026

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

Milestones in myoclonus.

Hiroshi Shibasaki1, Philip D Thompson

  • 1Kyoto University Graduate School of Medicine and Takeda General Hospital, Kyoto, Japan.

Movement Disorders : Official Journal of the Movement Disorder Society
|June 1, 2011
PubMed
Summary
This summary is machine-generated.

Recent advances consolidate myoclonus classification and identify new genetic causes. However, effective treatments for this neurological disorder remain limited, highlighting a need for further therapeutic development.

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Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI
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Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

Published on: April 18, 2011

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Behavioral Characterization of Pentylenetetrazole-induced Seizures: Moving Beyond the Racine Scale
07:35

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Published on: July 8, 2025

Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI
14:55

Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

Published on: April 18, 2011

Area of Science:

  • Neurology
  • Neuroscience

Background:

  • Review of myoclonus understanding over the past 25 years.
  • Consolidation of myoclonus classification into cortical, brainstem, and spinal forms.
  • Each form exhibits distinct clinical features and physiological mechanisms.

Observation:

  • Identification of novel genetic etiologies for myoclonus.
  • Discovery of the molecular underpinnings for several myoclonus conditions.
  • Growing evidence implicates cerebellar disease in cortical reflex myoclonus.

Findings:

  • Established classification provides a framework for understanding myoclonus subtypes.
  • Genetic discoveries offer insights into the molecular basis of specific myoclonus disorders.
  • Cerebellar involvement is a key factor in cortical reflex myoclonus.

Implications:

  • Despite advances, the precise mechanisms and origins of myoclonus remain unclear in many cases.
  • Current therapeutic options for myoclonus are limited.
  • Future research should focus on developing more effective treatments for myoclonus.