Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Muscle Stimulation Frequency

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...

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:

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...

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.

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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Neurofilament-light in former athletes: a potential biomarker of neurodegeneration and progression.

European journal of neurology·2020

Same author

Measures of entropy and complexity in altered states of consciousness.

Cognitive neurodynamics·2018

Same author

Consciousness as a global property of brain dynamic activity.

Physical review. E·2018

Same author

Statistical mechanics of consciousness: Maximization of information content of network is associated with conscious awareness.

Physical review. E·2016

Same author

High sensitivity of spontaneous spike frequency to sodium leak current in a Lymnaea pacemaker neuron.

The European journal of neuroscience·2016

Same author

Frontotemporal correlates of impulsivity and machine learning in retired professional athletes with a history of multiple concussions.

Brain structure & function·2015

Search research articles

Related Experiment Video

Updated: Jul 16, 2026

Generation of Local CA1 γ Oscillations by Tetanic Stimulation

Generation of Local CA1 γ Oscillations by Tetanic Stimulation

Published on: August 14, 2015

Complex phase synchronization in epileptic seizures: evidence for a devil's staircase.

J L Perez Velazquez¹, L Garcia Dominguez, R Wennberg

¹Brain and Behaviour Programme, Department of Paediatrics, University of Toronto and Hospital for Sick Children, Toronto M5G1X8, Canada. jose-luis.perezvelazquez@sickkids.ca

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 16, 2007

Summary

Epileptic seizures exhibit complex multifrequency phase synchronization, not just simple 1:1 frequency locking. This "devil's staircase" phenomenon in brain activity may indicate re-entrant mechanisms similar to cardiac arrhythmias.

More Related Videos

Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients

Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients

Published on: December 18, 2016

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

Published on: December 6, 2016

Related Experiment Videos

Last Updated: Jul 16, 2026

Generation of Local CA1 γ Oscillations by Tetanic Stimulation

Generation of Local CA1 γ Oscillations by Tetanic Stimulation

Published on: August 14, 2015

Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients

Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients

Published on: December 18, 2016

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

Published on: December 6, 2016

Area of Science:

Neuroscience
Epileptology
Nonlinear Dynamics

Background:

Epileptic seizures are characterized by abnormal brain activity.
Previous research primarily focused on 1:1 frequency locking during seizures.
Understanding seizure dynamics is crucial for developing effective treatments.

Purpose of the Study:

To investigate multifrequency phase synchronization in epileptic seizures.
To explore complex frequency coordination beyond simple 1:1 locking.
To identify potential underlying mechanisms of seizure generation.

Main Methods:

Utilized magnetoencephalography (MEG) recordings from three patients with generalized epileptic seizures.
Analyzed MEG data to identify phase synchronization patterns across multiple frequencies.
Investigated the occurrence of complex frequency coordination, including "devil's staircase" patterns.

Main Results:

Evidence of multifrequency phase synchronization was observed in epileptic seizures.
Complex frequency coordination, resembling a "devil's staircase," was identified in some cases.
This phenomenon extends beyond the commonly studied 1:1 frequency locking.

Conclusions:

Epileptic seizures exhibit complex multifrequency phase synchronization.
The observed patterns suggest potential re-entrant mechanisms in the cerebral neocortex during seizures.
These findings may offer insights into pathological brain activity dynamics and similarities with cardiac arrhythmias.