Modulation of Sensory Acuity With Transcranial Magnetic Stimulation (TMS)

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

WITHDRAWN

Clinical Phase

NA

Study Classification

INTERVENTIONAL

Study Start Date

2025-07-31

Study Completion Date

2026-07-31

Brief Summary

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The purpose of this research study is to understand how the brain processes and controls speech in healthy people. The investigators are doing this research because it will help identify the mechanisms that allow people to perceive their own speech errors and to learn new speech sounds, which may be applied to people who have communication disorders. 15 participants will be enrolled into this part of the study and can expect to be on study for 4 visits of 2-4 hours each.

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Detailed Description

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The overall study (Establishing the clinical utility of sensorimotor adaptation for speech rehabilitation) aims to understand how cognitive, perceptual, and motor processes are integrated in the control of speech movements. The investigators study how this complex skill is performed in healthy speakers to understand how this system functions, how this skill relates to the perception of speech, and what role different parts of the brain play in this process. Different studies look at how speech motor control is executed, maintained, and changed. Overall, the study will recruit 329 participants over the course of 5 years. Participants can expect to be on study for up to 3 weeks.

The entire study is composed of 8 experiments and 6 interventions. The present record represents the experiments involving transcranial magnetic stimulation (TMS), i.e. Experiment 8: Modulating sensorimotor adaptation through TMS to somatosensory cortex.

This paradigm uses theta-burst transcranial magnetic stimulation (tbTMS) to modulate the excitability of sensory cortices to examine the effect on sensory acuity and sensorimotor adaptation. Participants will complete three total sessions targeting primary somatosensory cortex (S1): one using intermittent theta-burst stimulation (iTBS), one using continuous theta-burst stimulation (cTBS), and one with sham stimulation.

The effect of the stimulation on somatosensory adaptation will be measured using a vowel centralization feedback perturbation experiment: after stimulation, participants will produce words under conditions of altered auditory feedback, and the investigators will measure changes in produced vowels as a result of these alterations.

Conditions

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Speech

Study Design

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Allocation Method

NA

Intervention Model

SINGLE_GROUP

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

NONE

Study Groups

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Healthy Adult Speakers

healthy adult participants across the lifespan in three groups:18-35, 36-55, and 56+

Group Type EXPERIMENTAL

TMS

Intervention Type DEVICE

This paradigm uses theta-burst transcranial magnetic stimulation (tbTMS) to modulate the excitability of sensory cortices to examine the effect on sensory acuity and sensorimotor adaptation. Participants will complete three total sessions targeting primary somatosensory cortex (S1): one using intermittent theta-burst stimulation (iTBS), one using continuous theta-burst stimulation (cTBS), and one with sham stimulation.

Speaking Tasks

Intervention Type BEHAVIORAL

Participants will produce four training words under a vowel centralization feedback paradigm in which auditory feedback is altered. The investigators will measure changes in produced vowels as a result of the altered feedback in concert with the different stimulation regimes described in the TMS intervention.

Interventions

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TMS

This paradigm uses theta-burst transcranial magnetic stimulation (tbTMS) to modulate the excitability of sensory cortices to examine the effect on sensory acuity and sensorimotor adaptation. Participants will complete three total sessions targeting primary somatosensory cortex (S1): one using intermittent theta-burst stimulation (iTBS), one using continuous theta-burst stimulation (cTBS), and one with sham stimulation.

Intervention Type DEVICE

Speaking Tasks

Participants will produce four training words under a vowel centralization feedback paradigm in which auditory feedback is altered. The investigators will measure changes in produced vowels as a result of the altered feedback in concert with the different stimulation regimes described in the TMS intervention.

Intervention Type BEHAVIORAL

Other Intervention Names

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transcranial magnetic stimulation (continuous and intermittent theta-burst stimulation), electromyography (EMG)

Eligibility Criteria

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Inclusion Criteria

* English-speaking adults
* normal hearing and speech
* no history of stroke or neurological conditions

Exclusion Criteria

* Native language other than English
* Any neurological disorders other than the disorder of interest
* Any history of hearing disorders
* Uncorrected vision problems that prevent participants from seeing visually-presented stimuli
* Significant cognitive impairments that prevent participants from carrying out the task or from giving informed consent
* Vulnerable populations (minors and prisoners)
* Additional exclusionary criteria for TMS:

* Implanted paramagnetic materials (metal clips, plates, pacemakers, etc.)
* Increased risk in the event of a seizure
* Serious heart disease
* Increased intracranial pressure
* Pregnancy
* History of seizures
* Family history of epilepsy
* Epileptogenic medications
* Chronic or transient disruption of sleep (including jet lag)
* History of fainting
* Chronic or transient increase in stressful experiences
* Use of illegal drugs
* If the TMS visit involves a visual acuity task at the same time as TMS\] Use of glasses at the research study visit

Minimum Eligible Age

18 Years

Maximum Eligible Age

70 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes