Transcranial Magnetic Stimulation Clinical Trial
— StimSpeechComOfficial title:
Enhancing Speech Intelligibility Using Transcranial Alternating Current Stimulation (tACS)
This study contributes to fundamental research investigating the role of the articulatory-motor integration and cerebro-acoustic coherence in speech comprehension. In a series of experiments non-invasive brain stimulation (NIBS) techniques including transcranial electric stimulation with alternating current waveforms (tACS) and transcranial magnetic stimulation (TMS) will be applied to the left ventral motor cortex (vMC) to test the contribution of this area to speech comprehension under challenging listening situations. As long as the exclusion criteria for TMS and tACS are strictly considered, only very minimal risks and no long-term effects are expected. There are no known risks associated with NIBS and pregnancy; however, since risks cannot be completely excluded, pregnant women will be excluded from participation. If a female participant is uncertain whether she is pregnant, she will be provided with a pregnancy test at no cost.
Status | Recruiting |
Enrollment | 190 |
Est. completion date | February 28, 2024 |
Est. primary completion date | February 28, 2024 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 18 Years to 80 Years |
Eligibility | Inclusion Criteria: - Written informed consent by the participant - Age: 18-35 / 65+ - Normal (or corrected to normal) vision - German as a first language - Right-handed Exclusion Criteria: - hearing loss - Raised bi- or multilingual - Women who are currently pregnant or breastfeeding - Known or suspected drug or alcohol abuse - History of brain injury or any neurological disorder (y/n) - For example, stroke, traumatic brain injury, brain surgery, epilepsy etc. - Dyslexia - History of psychiatric disorder - Recent drug consumption - Medication with cognitive side effects (e.g. psychoactive medications or sleeping pills) - Metallic implants in the head region (excluding fixed braces and tooth fillings) - Any implanted medical device (e.g. cardiac pacemakers) - previous enrolment in one of the experiments comprising the main investigational plan |
Country | Name | City | State |
---|---|---|---|
Switzerland | Department of Psychology, University of Zurich | Zürich |
Lead Sponsor | Collaborator |
---|---|
University of Zurich | University Hospital Inselspital, Berne |
Switzerland,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | articulatory motor-evoked potential (aMEP) amplitude (Experiment 1) - time point 1 | The comparison of articulatory motor-evoked potential (aMEP) amplitude after tACS and sham stimulation | online (during tACS intervention) | |
Primary | articulatory motor-evoked potential (aMEP) amplitude (Experiment 1) - time point 2 | The comparison of articulatory motor-evoked potential (aMEP) amplitude after tACS and sham stimulation | 5min after tACS | |
Primary | articulatory motor-evoked potential (aMEP) amplitude (Experiment 1) - time point 3 | The comparison of articulatory motor-evoked potential (aMEP) amplitude after tACS and sham stimulation | 55min after (tACS) | |
Primary | degraded speech comprehension (Experiment 2) | Subjects will listen and transcribe noise-vocoded sentence according to their subjective intelligibility levels (75% (easy), 50% (medium) and 25% (difficult)) assessed prior to the expermental manipulation
Comparison of degraded speech comprehension following tACS over the left ventral motor cortex (vMC) with performance following sham stimulation over the same region. |
right after tACS or sham stimulation (cross-over design) | |
Primary | degraded speech comprehension (Experiment 3) | Subjects will listen and transcribe noise-vocoded sentence according to their subjective intelligibility levels (75% (easy), 50% (medium) and 25% (difficult)) assessed prior to the expermental manipulation
Comparison of degraded speech comprehension following tACS over the left ventral motor cortex (vMC) with performance following sham stimulation over the same region. |
20min after tACS or sham stimulation (between-group design), following a training of degraded speech comprehension | |
Primary | degraded speech comprehension (Experiment 4) | Subjects will listen and transcribe noise-vocoded sentence according to their subjective intelligibility levels (75% (easy), 50% (medium) and 25% (difficult)) assessed prior to the expermental manipulation
The comparison of degraded speech comprehension between concomitant low-frequency (theta-band) speech envelope-shaped tACS (env-tACS), reversed env-tACS, and sham stimulation over left ventral motor cortex |
during env-tACS or sham stimulation (online) | |
Secondary | syllable discrimination ability (Experiment 1) - time point 1 | Subjects will be presented with two different eight-step syllable continua (da-ba or da-ga). Discrimination ability will be assessed by fitting logistic curves to obtain the slopes and positions of phonetic category boundaries before and after tACS stimulation. The slope index will be taken as an estimate for the steepness of the fitted curve. The steepness of the curve reflects the syllable discrimination ability of the participants. Participants with steeper logic are better in discriminating the two syllables of the continuum
The comparison of syllable discrimination ability following tACS stimulation and sham stimulation |
before tACS or sham stimulation (cross-over design) | |
Secondary | syllable discrimination ability (Experiment 1) - time point 2 | Subjects will be presented with two different eight-step syllable continua (da-ba or da-ga). Discrimination ability will be assessed by fitting logistic curves to obtain the slopes and positions of phonetic category boundaries before and after tACS stimulation. The slope index will be taken as an estimate for the steepness of the fitted curve. The steepness of the curve reflects the syllable discrimination ability of the participants. Participants with steeper logic are better in discriminating the two syllables of the continuum
The comparison of syllable discrimination ability following tACS stimulation and sham stimulation |
5min after tACS or sham stimulation (cross-over design) | |
Secondary | speech degradation level (Experiment 2) | Subjects will listen and transcribe noise-vocoded sentence according to their subjective intelligibility levels (75% (easy), 50% (medium) and 25% (difficult)) assessed prior to the expermental manipulation
We will compare the impact of tACS stimulation (relative to sham) across different speech degradation levels. |
right after tACS or sham stimulation (cross-over design) | |
Secondary | age group dependent tACS modulation (Experiment 2) | Subjects will listen and transcribe noise-vocoded sentence according to their subjective intelligibility levels (75% (easy), 50% (medium) and 25% (difficult)) assessed prior to the expermental manipulation
We will compare the impact of tACS stimulation (relative to sham) across different age groups, i.e., comparison of degraded speech comprehension between younger and older participants. |
right after tACS or sham stimulation (cross-over design) | |
Secondary | speech degradation level (Experiment 3) | Subjects will listen and transcribe noise-vocoded sentence according to their subjective intelligibility levels (75% (easy), 50% (medium) and 25% (difficult)) assessed prior to the expermental manipulation
We will compare the impact of tACS stimulation (relative to sham) across different speech degradation levels. |
20min after tACS or sham stimulation, following a training of degraded speech comprehension | |
Secondary | age group dependent tACS modulation (Experiment 3) | Subjects will listen and transcribe noise-vocoded sentence according to their subjective intelligibility levels (75% (easy), 50% (medium) and 25% (difficult)) assessed prior to the expermental manipulation
We will compare the impact of tACS stimulation (relative to sham) across different age groups, i.e., comparison of degraded speech comprehension between younger and older participants. |
20min after tACS or sham stimulation (between-group design), following a training of degraded speech comprehension | |
Secondary | word length (Experiment 4) | comparison of the effects of tACS-induced modulation of speech-brain entrainment on the comprehension of monosyllabic vs. polysyllabic items. | during env-tACS or sham stimulation (online) | |
Secondary | tACS-auditory stimulus timing (Experiment 4) | We will compared degraded speech comprehension across different tACS-auditory stimulus onset lags. | during env-tACS | |
Secondary | age group dependent tACS modulation (Experiment 4) | Subjects will listen and transcribe noise-vocoded sentence according to their subjective intelligibility levels (75% (easy), 50% (medium) and 25% (difficult)) assessed prior to the expermental manipulation
We will compare the impact of tACS stimulation (relative to sham) across different age groups, i.e., comparison of degraded speech comprehension between younger and older participants. |
during env-tACS, reversed env-tACS or sham stimulation (online) |
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