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High-Density Direct Current Brain Polarization

This study has been completed.
Sponsor:
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
NCT00944931
First received: July 22, 2009
Last updated: March 14, 2012
Last verified: February 2012
  Purpose

Background:

  • Direct current (DC) brain polarization is a technique in which very weak electricity is applied to the head. Doctors have used DC polarization for many years on patients and healthy people with no known serious side effects. Earlier, researchers found that DC polarization can temporarily improve the ability of healthy people to think of certain words.
  • A disadvantage of existing methods of DC polarization is that they use large electrodes and the current spreads over a large area of the brain. This makes it difficult to target particular brain areas. High-density DC polarization uses several small electrodes to focus the current in a small area of the brain. This study will test high-density DC polarization for the first time in humans.

Objectives:

  • To see how well high-density direct current polarization works in the brain.
  • To test a new method of performing direct current brain polarization.

Eligibility:

- Healthy, right-handed adults, ages 18 and older, who have no history of neurological or psychiatric illnesses.

Design:

  • After an initial screening visit with clinical examination, participants may be assigned to one or both experiments of the study.
  • Experiment 1: Participants will have electrodes placed on the left side of their heads, and will be asked to say aloud as many words as they can think of that begin with certain letters. After the high-density DC polarization current is turned on and run for 10 minutes, participants will say words beginning with a different set of letters and perform reaction time and thinking speed tests. Some participants will receive real polarization and others will not, although all participants will be told that they are receiving the polarization.
  • Experiment 2: Participants will have DC brain polarization performed with transcranial magnetic stimulation (TMS), which uses magnetic pulses to activate nerve cells in the brain. We will use TMS to help us understand how far the effect of DC polarization spreads in the brain. After attaching electrodes to a point on the scalp above the ear, researchers will give about 50 TMS pulses to five different places near this area. These pulses will produce some painless muscle twitches in the hand or arm. The TMS pulses will be followed by the DC brain polarization, and then by another set of TMS pulses to see if there are any differences in muscle response.

Condition Intervention Phase
Healthy Volunteer
HV
Device: DC Brain Polarization
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Single Blind
Primary Purpose: Treatment
Official Title: High-Density Direct Current Brain Polarization

Further study details as provided by National Institutes of Health Clinical Center (CC):

Primary Outcome Measures:
  • Verbal fluency; focality of effect on MEP (exploratory)

Enrollment: 30
Study Start Date: July 2009
Study Completion Date: April 2011
Primary Completion Date: April 2011 (Final data collection date for primary outcome measure)
Intervention Details:
    Device: DC Brain Polarization
    N/A
Detailed Description:

Objective:

The principal objectives are: 1) to explore the effectiveness of anodal high-density direct current (HDDC) stimulation of the brain; and 2) test the focality of the technique.

Study Population:

Up to 81 healthy volunteers over the age of 18 will be enrolled.

Design:

We will perform three studies:

  1. A parallel trial of anodal and sham HDDC delivered to the lateral prefrontal area,
  2. An exploratory evaluation of the focality of HDDC in the motor cortex and
  3. A study to determine whether HDDC can be better targeted using a finite element model (FEM) based on the individual subject's MRI scan (obtained as part of the study).

Outcome Measures:

The primary outcome measures are the effect of anodal HDDC (relative to sham) on category verbal fluency, and the decay in the HDDC-induced change in corticospinal output excitability with distance from the active electrode. Performance on the California Computerized Assessment Package is included as a secondary safety outcome.

  Eligibility

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria
  • INCLUSION CRITERIA:

Healthy volunteers over age 18

EXCLUSION CRITERIA:

Any history of central nervous system illness or behavioral disorder

Broken skin or other lesions in the area of the electrodes

Uncontrolled medical problems, such as diabetes mellitus, hypertension, pulmonary or airway disease, heart failure, coronary artery disease, or any other condition that poses a risk for the subject during participation or potentially worsen the outcome of a burn

Presence of metal in the cranial cavity

Holes in the skull made by trauma or surgery

Pacemakers, medication pumps, and other implanted electronic hardware

Pregnancy (female volunteers who have the potential to become pregnant will have urine pregnancy test performed within 24 hours of participation)

Left handers will be excluded from Experiment 1

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00944931

Locations
United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
Investigators
Principal Investigator: William H Theodore, M.D. National Institute of Neurological Disorders and Stroke (NINDS)
  More Information

Publications:
ClinicalTrials.gov Identifier: NCT00944931     History of Changes
Other Study ID Numbers: 090196, 09-N-0196
Study First Received: July 22, 2009
Last Updated: March 14, 2012
Health Authority: United States: Federal Government

Keywords provided by National Institutes of Health Clinical Center (CC):
Cerebral Cortex
Cognition
Motor Cortex
Cognitive Enhancement
Prefrontal Cortex
Healthy Volunteer

ClinicalTrials.gov processed this record on November 20, 2014