Modulating Speech Perception With Current Stimulation

NCT ID: NCT05446350

Last Updated: 2022-08-19

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

UNKNOWN

Clinical Phase

NA

Total Enrollment

126 participants

Study Classification

INTERVENTIONAL

Study Start Date

2022-07-01

Study Completion Date

2025-09-30

Brief Summary

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This study aims to further develop tACS as a tool to improve speech perception, by manipulation of brain-speech synchronisation ("entrainment"), thereby transforming a promising approach into a technique that can benefit to society on a large scale.

Detailed Description

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Neural oscillations align their phase to the rhythm of speech. This phenomenon is termed neural entrainment and associated with successful speech comprehension. Importantly, we have demonstrated that transcranial alternating current stimulation (tACS) can be used to manipulate how neural activity aligns to speech rhythm, leading to changes in speech perception. The aim of Experiment 1 is to understand how tACS operates on the neural level. This aim will be reached by testing whether tACS produces rhythmic electroencephalography (EEG) responses that outlast the stimulation, indicating an involvement of endogenous oscillatory activity. The aim of Experiment 2 is to increase efficacy of tACS and, consequently, its potential to play an important role in research and everyday life applications. This aim will be reached by using brain imaging (fMRI) to predict optimal stimulation protocols for individual participants. The aim of Experiment 3 is to reveal how tACS can boost speech perception in a multi-speaker scenario. This aim will be reached by using tACS to enhance attended speech or suppress distracting speech, and by comparing these two approaches in their efficacy to boost speech perception. The aim of Experiment 4 is to combine established techniques to create novel opportunities to improve speech perception. This aim will be reached by using neurofeedback to teach participants to enhance their own neural entrainment, applying tACS to support them in this process.

Conditions

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Healthy

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

SINGLE

Participants
masking to the conditions of the experiments

Study Groups

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Experiment 1

The aim of Experiment 1 is to understand how tACS operates on the neural level

Group Type EXPERIMENTAL

transcranial alternating current stimulation (tACS)

Intervention Type PROCEDURE

transcranial alternating current stimulation (tACS) used to manipulate how neural activity aligns to speech rhythm, leading to changes in speech perception

electroencephalography (EEG)

Intervention Type PROCEDURE

analyse rhythmic electroencephalography responses that outlast the stimulation

Experiment 2

The aim of Experiment 2 is to increase efficacy of tACS and, consequently, its potential to play an important role in research and everyday life applications

Group Type EXPERIMENTAL

transcranial alternating current stimulation (tACS)

Intervention Type PROCEDURE

transcranial alternating current stimulation (tACS) used to manipulate how neural activity aligns to speech rhythm, leading to changes in speech perception

brain imaging (fMRI)

Intervention Type PROCEDURE

Using brain imaging (fMRI) to predict optimal stimulation protocols for individual participants

Experiment 3

The aim of Experiment 3 is to reveal how tACS can boost speech perception in a multi-speaker scenario.

Group Type EXPERIMENTAL

transcranial alternating current stimulation (tACS)

Intervention Type PROCEDURE

transcranial alternating current stimulation (tACS) used to manipulate how neural activity aligns to speech rhythm, leading to changes in speech perception

Experiment 4

The aim of Experiment 4 is to combine established techniques to create novel opportunities to improve speech perception

Group Type EXPERIMENTAL

transcranial alternating current stimulation (tACS)

Intervention Type PROCEDURE

transcranial alternating current stimulation (tACS) used to manipulate how neural activity aligns to speech rhythm, leading to changes in speech perception

electroencephalography (EEG) with neurofeedback

Intervention Type PROCEDURE

Using neurofeedback to teach participants to enhance their own neural entrainment

Interventions

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transcranial alternating current stimulation (tACS)

transcranial alternating current stimulation (tACS) used to manipulate how neural activity aligns to speech rhythm, leading to changes in speech perception

Intervention Type PROCEDURE

electroencephalography (EEG)

analyse rhythmic electroencephalography responses that outlast the stimulation

Intervention Type PROCEDURE

brain imaging (fMRI)

Using brain imaging (fMRI) to predict optimal stimulation protocols for individual participants

Intervention Type PROCEDURE

electroencephalography (EEG) with neurofeedback

Using neurofeedback to teach participants to enhance their own neural entrainment

Intervention Type PROCEDURE

Eligibility Criteria

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Inclusion Criteria

* Subject aged between 18 and 50 years old
* informed written consent
* Absence of pro-epileptogenic drugs
* Absence of visual or hearing impairment incompatible with participation in the study

Exclusion Criteria

* Pregnant or breastfeeding women,
* Persons protected by law adults under guardianship or curatorship
* Persons not affiliated to a Social Security scheme
* Subjects with progressive psychiatric or neurological pathology
* Subjects with a contraindication to tCS or MRI (history of epilepsy, severe head injury or brain/spinal cord surgery, cardiac pacemaker/defibrillator, implanted equipment activated by electrical, magnetic or mechanical system, hemostatic clip carriers of intracerebral aneurysms or carotid arteries, orthopedic implant carriers, claustrophobic, pregnancy).
Minimum Eligible Age

18 Years

Maximum Eligible Age

50 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes

Sponsors

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Centre National de la Recherche Scientifique, France

OTHER

Sponsor Role collaborator

University Hospital, Toulouse

OTHER

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Mathieu MARX, PU-PH

Role: PRINCIPAL_INVESTIGATOR

University Hospital, Toulouse

Locations

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CHU Toulouse

Toulouse, , France

Site Status RECRUITING

Countries

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France

Central Contacts

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Mathieu MARX, PU-PH

Role: CONTACT

+33 (0)5 61 77 77 04 ext. 33

Benedikt ZOEFEL, MD

Role: CONTACT

Facility Contacts

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Mathieu MARX, PU-PH

Role: primary

05 61 77 77 04 ext. +33

References

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van Bree S, Sohoglu E, Davis MH, Zoefel B. Sustained neural rhythms reveal endogenous oscillations supporting speech perception. PLoS Biol. 2021 Feb 26;19(2):e3001142. doi: 10.1371/journal.pbio.3001142. eCollection 2021 Feb.

Reference Type BACKGROUND
PMID: 33635855 (View on PubMed)

Zoefel B, Davis MH, Valente G, Riecke L. How to test for phasic modulation of neural and behavioural responses. Neuroimage. 2019 Nov 15;202:116175. doi: 10.1016/j.neuroimage.2019.116175. Epub 2019 Sep 6.

Reference Type BACKGROUND
PMID: 31499178 (View on PubMed)

Zoefel B, Allard I, Anil M, Davis MH. Perception of Rhythmic Speech Is Modulated by Focal Bilateral Transcranial Alternating Current Stimulation. J Cogn Neurosci. 2020 Feb;32(2):226-240. doi: 10.1162/jocn_a_01490. Epub 2019 Oct 29.

Reference Type BACKGROUND
PMID: 31659922 (View on PubMed)

Other Identifiers

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2020-A02707-32

Identifier Type: OTHER

Identifier Source: secondary_id

STIMPAROLE

Identifier Type: OTHER

Identifier Source: secondary_id

RC31/20/0340

Identifier Type: -

Identifier Source: org_study_id

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