iTBS/fMRI Study of Apex Control

NCT ID: NCT06919172

Last Updated: 2026-02-02

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

RECRUITING

Clinical Phase

NA

Total Enrollment

40 participants

Study Classification

INTERVENTIONAL

Study Start Date

2025-01-06

Study Completion Date

2026-11-30

Brief Summary

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The objective of this study is to examine the effect of transcranial magnetic stimulation (TMS) on the prefrontal cortex and posterior parietal cortex.

Detailed Description

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The Comprehensive Control Task (CCT) was designed to examine hierarchical control in a single, well-controlled factorial task. On each trial, participants view a letter surrounded by a colored shape at a particular screen location. Color cues the relevant feature, letter or location, for a block of trials. The first trial of a block requires a decision of whether the stimulus is the first position of a circular sequence (sequence start). Subsequent trials require a decision of whether the viewed stimulus follows the previous stimulus in a circular sequence (sequence 1-back). The letter sequence (T-A-B-L-E-T) and spatial sequence (Top-Bottom Right-Left-Right-Bottom Left-Top) are difficulty-matched.

Shape cues the task to perform. Squares indicate the standard baseline task, and each block begins and ends with baseline trials. Different shapes indicate sub-tasks. In Switching blocks, shape-switches (e.g. from square to circle or circle to square) cue the sequence start task. Shape-repeats cue the sequence 1-back task. In Planning blocks, triangle shapes indicate that the stimulus can be ignored (automatic "no" response). All the while, the last square-shaped stimulus must be retained as a reference for the next square-shaped stimulus. Finally, in Dual blocks, diamond shapes indicate switching (sequence start) and also planning. The reversion back to square shapes requires sequence matching to the distal, previous square.

The design is factorial with stimulus-domain x contextual control x temporal control orthogonally manipulated. Full details of the CCT have been previously described in published work.

The focus in this study will be comparison of MFG-TMS, IPL-TMS, and S1-TMS in an interleaved fMRI-TMS-fMRI design. The logic is to test the apical status of the MFG/IPL through the extent to which TMS impacts other PFC/PPC areas and behavior.

Each experiment will begin with 1 session of the CCT with fMRI to localize TMS targets. Each participant will then perform 3 counter-balanced sessions wherein a different site will be targeted by TMS followed immediately by fMRI on the CCT.

Conditions

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Transcranial Magnetic Stimulation

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

SINGLE

Participants

Study Groups

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MFG-TMS

Transcranial magnetic stimulation to the middle frontal gyrus. 600 pulses delivered in 50 Hz bursts every 5 Hz for 2 seconds repeated every 10 seconds at 80% of resting motor threshold.

Group Type EXPERIMENTAL

transcranial magnetic stimulation

Intervention Type DEVICE

Transcranial magnetic stimulation delivered to the scalp targeting specific brain structures via stereotactic guidance.

IPL-TMS

Transcranial magnetic stimulation to the inferior parietal lobule. 600 pulses delivered in 50 Hz bursts every 5 Hz for 2 seconds repeated every 10 seconds at 80% of resting motor threshold.

Group Type EXPERIMENTAL

transcranial magnetic stimulation

Intervention Type DEVICE

Transcranial magnetic stimulation delivered to the scalp targeting specific brain structures via stereotactic guidance.

S1-TMS

Transcranial magnetic stimulation to the primary somatosensory cortex. 600 pulses delivered in 50 Hz bursts every 5 Hz for 2 seconds repeated every 10 seconds at 80% of resting motor threshold.

Group Type ACTIVE_COMPARATOR

transcranial magnetic stimulation

Intervention Type DEVICE

Transcranial magnetic stimulation delivered to the scalp targeting specific brain structures via stereotactic guidance.

Interventions

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transcranial magnetic stimulation

Transcranial magnetic stimulation delivered to the scalp targeting specific brain structures via stereotactic guidance.

Intervention Type DEVICE

Eligibility Criteria

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Inclusion Criteria

* Between the ages of 18 and 30
* Right-handed
* Native English speaker or fluent by the age of 6

Exclusion Criteria

* History of psychiatric disorders
* History of neurological disorders
* Receiving medications for psychiatric or neurological disorders
* Familial history of epilepsy
* Taking any drugs or medications that are pro-epileptic
* Tinnitus
* Women who are pregnant
Minimum Eligible Age

18 Years

Maximum Eligible Age

30 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes

Sponsors

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National Institute of Mental Health (NIMH)

NIH

Sponsor Role collaborator

Florida State University

OTHER

Sponsor Role lead

Responsible Party

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Derek Nee

Associate Professor

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Derek Nee, PhD

Role: PRINCIPAL_INVESTIGATOR

Florida State University

Locations

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Florida State University Psychology Department Building

Tallahassee, Florida, United States

Site Status RECRUITING

FSU MRI Facility

Tallahassee, Florida, United States

Site Status RECRUITING

Countries

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United States

Central Contacts

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Derek Nee, PhD

Role: CONTACT

850-644-1963

Facility Contacts

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Derek Nee, PhD

Role: primary

850-644-1963

Alecia Lapointe, MA

Role: primary

850-644-1889

Other Identifiers

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R01MH121509

Identifier Type: NIH

Identifier Source: secondary_id

View Link

0000033961

Identifier Type: -

Identifier Source: org_study_id

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