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Modeling TMS-induced Cortical Network Activity

NCT05288959 · Status: NOT_YET_RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 80

Last updated 2022-03-21

No results posted yet for this study

Summary

This is a study of normal brain physiology in healthy human volunteers. The study aims to understand the physiology of connectivity between brain regions. To reach this aim, it delivers single-pulse transcranial magnetic stimulation (spTMS) to one or two brain areas at a time while electroencephalography (EEG) is measured. When only one brain area is stimulated (uni-focal TMS), the goal is to record how many milliseconds it takes for the activity to spread from the stimulated area to other brain regions (conduction delay). When two brain areas are stimulated (bi-focal TMS), the TMS pulses are separated by a short millisecond-level time interval ("asynchrony") in a so-called paired associative stimulation (PAS) design. The central hypothesis is that PAS may increase or decrease connectivity between the stimulated areas depending on the asynchrony value. All techniques in the study are non-invasive and considered safe.

Conditions

  • Healthy

Interventions

DEVICE

Session 2: Single-pulse TMS (spTMS)

Uni-focal TMS (MagVenture, Farum, Denmark) is delivered to one brain area while EEG/EMG (NeurOne, Bittium, Kuopio, Finland) are recorded. The targeted brain areas and TMS intensities may vary across runs. An MRI-based TMS navigation system (Localite, Bonn, Germany) is used to navigate the TMS coil.

DEVICE

Sessions 3 - 5: Paired associative stimulation (PAS)

During each PAS run, bi-focal TMS (MagVenture, Farum, Denmark) is delivered to two brain areas while EEG/EMG (NeurOne, Bittium, Kuopio, Finland) are recorded. The asynchronies between the two TMS coils are kept constant within each session but differ across sessions. Within each session, to observe PAS effects on connectivity, uni-focal spTMS is delivered to the stimulated areas before and after the PAS modulation while EEG/EMG (NeurOne, Bittium, Kuopio, Finland) are recorded. In addition, resting-state EEG/EMG and a behavioral measure (bimanual task coordination) are recorded before and after the PAS modulation. An MRI-based TMS navigation system (Localite, Bonn, Germany) is used to navigate the TMS coils.

Sponsors & Collaborators

  • Massachusetts General Hospital

    lead OTHER

Principal Investigators

  • Aapo Nummenmaa, PhD · Massachusetts General Hospital

Study Design

Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Max Age
64 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2022-04-01
Primary Completion
2027-03-31
Completion
2027-03-31

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05288959 on ClinicalTrials.gov