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

$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

RNA Interference

RNA Interference

RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...

Interference and Decay

Interference and Decay

Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
Interference occurs when competing memories hinder the retrieval of particular information. It can be classified into two types: proactive and retroactive interference. Proactive...

Interference: Path Lengths

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

Interference and Superposition of Waves

Interference and Superposition of Waves

When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...

Sound Waves: Interference

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...

You might also read

Related Articles

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

Sort by

Same author

Rapid functional reorganization of the targeted contralesional hemisphere induced by one week of noninvasive closed-loop neurofeedback guides motor recovery in post-stroke patients with chronic motor impairment: a phase I trial.

Communications medicine·2026

Same author

Efficacy of Cognitive Stimulation Therapy for Cognition in Patients with Vascular Cognitive Impairment: A Pilot Randomized Controlled Trial.

The Keio journal of medicine·2024

Same author

Macrostructural Cerebellar Neuroplasticity Correlates With Motor Recovery After Stroke.

Neurorehabilitation and neural repair·2023

Same author

Neural bases characterizing chronic and severe upper-limb motor deficits after brain lesion.

Journal of neural transmission (Vienna, Austria : 1996)·2023

Same author

Electrically Induced Sensory Trick in a Patient with Musician's Dystonia: A Case Report.

Brain sciences·2023

Same author

Response to the Letter to the editor, JSCVD-D-22-01922.

Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association·2023

Search research articles

Related Experiment Video

Updated: Jan 21, 2026

Nerve Ultrasound Protocol to Detect Dysimmune Neuropathies

Nerve Ultrasound Protocol to Detect Dysimmune Neuropathies

Published on: October 7, 2021

Quantitative Evaluation of Interference Patterns on Electromyography in Neuropathy.

Yukiko Kobayashi¹, Kazuto Akaboshi, Osamu Takahashi

¹From the Department of Rehabilitation Medicine, Keio University School of Medicine, Tokyo, Japan.

American Journal of Physical Medicine & Rehabilitation

|July 24, 2019

Summary

This study developed a quantitative method to evaluate needle electromyography interference patterns for diagnosing neuropathy. The "activity" parameter proved highly effective in identifying nerve damage, aiding clinical assessments.

More Related Videos

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Published on: January 24, 2025

Rat Model of Photochemically-Induced Posterior Ischemic Optic Neuropathy

Rat Model of Photochemically-Induced Posterior Ischemic Optic Neuropathy

Published on: November 29, 2015

Related Experiment Videos

Last Updated: Jan 21, 2026

Nerve Ultrasound Protocol to Detect Dysimmune Neuropathies

Nerve Ultrasound Protocol to Detect Dysimmune Neuropathies

Published on: October 7, 2021

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Published on: January 24, 2025

Rat Model of Photochemically-Induced Posterior Ischemic Optic Neuropathy

Rat Model of Photochemically-Induced Posterior Ischemic Optic Neuropathy

Published on: November 29, 2015

Area of Science:

Neurology
Electrophysiology
Medical Diagnostics

Background:

Accurate diagnosis of neuropathy is crucial for effective rehabilitation.
Electrophysiological assessments are vital tools for physiatrists.
Current methods for evaluating electromyography interference patterns can be subjective.

Purpose of the Study:

To develop a quantitative, clinically applicable method for evaluating needle electromyography interference patterns.
To assess the usefulness of this quantitative method in diagnosing neuropathy.
To identify key parameters for reliable interference pattern analysis.

Main Methods:

Quantitative evaluation of 112 maximal interference patterns from upper extremity muscles.
Analysis of parameters including integration values, mean amplitudes, peak count, and "activity" (myoelectric signal duration during maximal voluntary contraction).
Examination of relationships between these parameters and pathological potentials.

Main Results:

The "activity" parameter demonstrated the highest diagnostic accuracy for neuropathy (Area Under the Curve = 0.917).
Integration values and mean amplitudes were effective in diagnosing chronic neuropathy with subtle interference pattern changes.
The developed quantitative method showed significant utility in neuropathy diagnosis.

Conclusions:

Quantitative evaluation of maximal contraction interference patterns is a valuable tool for neuropathy diagnosis.
The "activity" parameter offers a robust metric for identifying nerve damage.
This method enhances the objectivity and reliability of electromyography assessments in clinical practice.