21 Participants Needed

Magnetic Stimulation for Stroke Survivors

No Placebo GroupAll trial participants will receive the active study treatment (no placebo)

Trial Summary

What is the purpose of this trial?

Transcranial magnetic stimulation (TMS) interventions could feasibly strengthen residual corticospinal tract (CST) connections and enhance recovery of paretic hand function after stroke. To maximize the therapeutic effects of such interventions, they must be delivered during poststroke brain activity patterns during which TMS best activates the residual corticospinal tract and enhances neural transmission within it (i.e., brain state-dependent TMS). In this study, the investigators will test the feasibility of real-time, personalized brain state-dependent TMS in neurotypical adults. Participants will visit the laboratory for one day of testing. Upon arrival, participants will provide their informed consent; afterwards, they will complete eligibility screening. The investigators will then place recording electrodes on the scalp using a swim-type cap and on the left first dorsal interosseous, abductor pollicis brevis, and extensor digitorum communis muscles. After determining the location at which TMS best elicits muscle twitches in the left first dorsal interosseous, the investigators will determine the lowest possible intensity at which TMS elicits muscle twitches at least half of the time in this muscle. Then, the investigators will deliver 6 blocks of 100 single TMS pulses while the participant rests quietly with their eyes open; stimulation will be delivered at an intensity that is 20% greater than the lowest possible intensity at which TMS elicits muscle twitches at least half of the time. Afterwards, the investigators will use the muscle and brain activity recordings acquired during these 6 blocks to build a personalized mathematical model that identifies which patterns of brain activity correspond to the largest TMS-evoked muscle twitches. The investigators will then use this model to detect the occurrence of these brain activity patterns in real-time; when these patterns are detected, single TMS pulses will be delivered. Afterwards, all recording electrodes will be removed, participation will be complete, and participants will leave the laboratory. The investigators will recruit a total of 16 neurotypical adults for this study.

Eligibility Criteria

This trial is for neurotypical adults who can visit the lab for a day. They should be able to provide informed consent and pass eligibility screening, which includes not having certain conditions that could interfere with the study.

Inclusion Criteria

Ability to provide informed consent
Right-hand dominance
I am willing to participate in the clinical trial.

Exclusion Criteria

Presence of contraindications to transcranial magnetic stimulation (TMS) or peripheral nerve stimulation (PNS) including: history of adverse reactions to TMS or PNS, history of stroke or head injury, metal in head, eyes, neck, chest/trunk, or arms, implanted devices, history of frequent and severe headaches or migraines, immediate family history of seizure or epilepsy, personal history of seizure or epilepsy, current, suspected, or planned pregnancy, current or recent (within the last 3 months) use of medications acting on the central nervous system including antipsychotic drugs, antidepressants, benzodiazepines, prescription stimulants
I have a history of serious brain, bone, mental health, or heart conditions.

Timeline

Screening

Participants are screened for eligibility to participate in the trial

1 day
1 visit (in-person)

Testing and Model Building

Participants undergo TMS testing to determine optimal stimulation parameters and build a personalized mathematical model for brain state-dependent TMS.

1 day
1 visit (in-person)

Real-time TMS Application

Real-time TMS is applied based on the personalized model to test feasibility of brain state-dependent stimulation.

1 day
1 visit (in-person)

Follow-up

Participants are monitored for any immediate effects or adverse reactions post-TMS application.

1 day
1 visit (in-person)

Treatment Details

Interventions

  • Real-time, personalized brain state-dependent TMS
Trial Overview The study tests if personalized brain state-dependent Transcranial Magnetic Stimulation (TMS) can enhance muscle response by stimulating the brain during specific activity patterns. It involves recording muscle and brain activity to create a model for real-time TMS delivery.

Find a Clinic Near You

Who Is Running the Clinical Trial?

University of Texas at Austin

Lead Sponsor

Trials
387
Recruited
86,100+

Emory University

Collaborator

Trials
1,735
Recruited
2,605,000+
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