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Brain Stimulation and Vision Testing

NCT01617408 · Status: RECRUITING · Type: OBSERVATIONAL · Enrollment: 665

Last updated 2026-05-01

No results posted yet for this study

Summary

Background:

-The brain has two systems for recognizing objects. One system recognizes what an object is, and the other system recognizes where the object is located. However, there is much about how the brain handles and interprets the information from these two systems that is still unclear. Researchers want to study the parts of the brain that are involved in how vision is processed. They will use magnetic resonance imaging (MRI) and transcranial magnetic stimulation (TMS) or transcranial electrical stimulation (tES) on the brain. MRI measures what parts of the brain become more active when tasks are performed. TMS uses magnetic pulses to temporarily change the activity in parts of the brain. tES uses electrical current to temporarily change brain function.

Objectives:

-To better understand how people visually recognize different types of objects.

Eligibility:

-Healthy volunteers between 18 and 50 years of age, who only speak English.

Design:

* This study includes many different experiments on vision. Each experiment may combine visual tasks, MRI scans, and TMS or tES. Participants may be asked to have several different tests. Each test will require a separate visit to the National Institutes of Health.
* Participants will be screened with a physical exam and medical history. They will have a baseline brain scan at the first visit.
* Participants may do visual tasks alone, with MRI only, with TMS or tES only, or with MRI and TMS or tES combined. For the visual tasks, they will look at pictures of objects on a computer screen. Sometimes the images will appear very briefly (less than one-tenth of a second). Sometimes they will appear for up to 5 seconds. These images will be of things like faces, bodies, tools, and scenes. Participants will be asked to respond in different ways to the pictures. They may respond by typing on a computer keyboard or by pressing a button. Participants will have time to practice the tasks before the experiment.
* Participants will remain on the study for up to 3 years.

Conditions

  • fMRI
  • Dorsal Pathway
  • Ventral Pathway

Sponsors & Collaborators

  • National Institute of Mental Health (NIMH)

    lead NIH

Principal Investigators

  • Christopher I Baker, Ph.D. · National Institute of Mental Health (NIMH)

Eligibility

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

Timeline & Regulatory

Start
2013-03-04

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 NCT01617408 on ClinicalTrials.gov