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Updated: Jan 10, 2026

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

Published on: June 14, 2014

Sensorimotor Theta Oscillations Coordinate Speech Movements.

Yitzhak Norman^1,2, Loren M Frank^3,4,5, Edward F Chang^1,2,6

¹Department of Neurological Surgery, University of California, San Francisco; San Francisco, CA 94143, USA.

Biorxiv : the Preprint Server for Biology

|November 24, 2025

Summary

This summary is machine-generated.

Researchers found that brain waves called theta oscillations (6-10 Hz) are key to fluent speech. These brain rhythms coordinate the rapid movements needed for clear articulation and speech production.

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Area of Science:

Neuroscience
Speech Science
Motor Control

Background:

Fluent speech requires precise motor timing for articulatory gestures.
The neural mechanisms underlying speech timing are not fully understood.

Purpose of the Study:

To identify the neural oscillations involved in coordinating speech motor commands.
To investigate the role of sensorimotor theta oscillations in fluent articulation.

Main Methods:

Direct cortical recordings in humans during speech tasks.
Analysis of theta oscillations (6-10 Hz) and their phase coherence.
Correlation of neural activity with vocal-tract kinematics and speech rate.

Main Results:

A prominent sensorimotor theta oscillation (6-10 Hz) was identified during articulation.
Enhanced theta phase coherence and population activity near theta troughs were observed in premotor speech circuits.
Vocal-tract movements were tightly coupled to the cortical theta phase at 6-10 Hz.
Theta cycles structured sequential sensorimotor activations, with optimal syllable decoding following theta troughs.

Conclusions:

Sensorimotor theta oscillations serve as an intrinsic timing mechanism for fluent speech.
These oscillations coordinate distributed sensorimotor circuits for synergistic motor control in speech.
The findings highlight the critical role of neural timing in producing complex motor behaviors like speech.