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Related Concept Videos

Muscle Stimulation Frequency01:22

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...
Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...

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Related Experiment Video

Updated: Jun 28, 2026

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation
12:09

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

Published on: June 14, 2014

Persistent developmental stuttering as a cortical-subcortical dysfunction: evidence from muscle activation.

Claudia Regina Furquim de Andrade1, Fernanda Chiarion Sassi, Fabiola Juste

  • 1Departament of Physiotherapy, Speech-Language and Hearing Sciences and Occupational Therapy, School of Medicine, University of São Paulo, São Paulo, SP, Brazil. clauan@usp.br

Arquivos De Neuro-Psiquiatria
|October 25, 2008
PubMed
Summary

Stuttering adults show higher resting muscle tension than fluent individuals. Speech motor control anomalies, not just disfluencies, may indicate underlying neurological differences in stuttering.

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Area of Science:

  • Speech-language pathology
  • Neuroscience
  • Motor control

Background:

  • Contemporary theories suggest stuttering stems from atypical speech motor control.
  • This study investigates physiological differences in speech production between fluent and stuttering individuals.

Purpose of the Study:

  • To compare resting muscle tension and speech reaction time in adults who stutter and fluent adults.
  • To identify potential motor control differences contributing to stuttering.

Main Methods:

  • Electromyography (EMG) of the inferior orbicularis oris muscle was used.
  • Measurements were taken during rest and a speech reaction time task.
  • 22 adults participated: 11 fluent speakers and 11 individuals who stutter.

Main Results:

  • Stuttering adults exhibited significantly higher resting muscle tension compared to fluent adults.
  • No significant differences were found in speech reaction time or muscle activity during speech tasks.
  • A strong positive correlation was observed in stuttering adults between longer speech reaction times and increased speech muscle activity.

Conclusions:

  • Individuals who stutter display speech motor output anomalies even during fluent speech.
  • These findings suggest underlying neurological differences, potentially related to cortical-subcortical pathways, may contribute to stuttering.
  • Further research is warranted to explore these motor control deficits.