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Motor Unit Stimulation

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: Dec 25, 2025

Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia

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Anterior Sensorimotor Subthalamic Nucleus Stimulation Is Associated With Improved Voice Function.

Ahmed Jorge¹, Christina Dastolfo-Hromack^1,2, Witold J Lipski¹

¹Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania.

|March 22, 2020

Summary

Targeting the anterior sensorimotor region of the subthalamic nucleus (STN) during deep brain stimulation (DBS) can improve voice and speech in Parkinson disease (PD) patients. Specific lead placements are key for better vocal outcomes.

Keywords:

Cepstral Deep brain stimulation Parkinson disease Phonatory airflow Subthalamic nucleus Voice

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Published on: May 31, 2016

Area of Science:

Neurology
Speech Pathology
Biomedical Engineering

Background:

Parkinson disease (PD) significantly impacts speech communication.
The effect of subthalamic nucleus (STN) deep brain stimulation (DBS) lead location on voice outcomes is not well-established.

Purpose of the Study:

To investigate the relationship between STN DBS lead location and voice changes using cepstral analysis.
To determine if specific stimulation sites within the STN correlate with improved or worsened voice outcomes in PD patients.

Main Methods:

Speech pathology evaluations were conducted on 14 PD subjects pre- and post-STN DBS.
Evaluations included audio-perceptual ratings, dysphonia indices (cepstral peak prominence, cepstral spectral index), and phonatory aerodynamics.
Active stimulation contact locations were mapped and correlated with voice outcomes.

Main Results:

On average, voice outcomes showed minimal change.
Anterior sensorimotor STN stimulation on the left was linked to improved voice severity, dysphonia measures, and airflow.
Posterior STN locations were associated with worsening voice outcomes, while medial-lateral/dorsal-ventral positions and right-sided stimulation showed no correlation.

Conclusions:

Active contact placement in the anterior sensorimotor STN correlates with enhanced voice and speech outcomes in PD patients.
Findings suggest a topographical organization within the STN for speech motor control, offering potential for optimizing DBS therapy for communication deficits.