Neuromodulation Effects in Older Adults

November 18, 2024 updated by: University of Florida
The current study is a mechanistic study to evaluate working memory gains from application of transcranial direct current stimulation (tDCS) in older adults with mild cognitive impairments (MCI) compared to cognitively healthy control

Study Overview

Status

Withdrawn

Conditions

Intervention / Treatment

Detailed Description

The current study is a mechanistic study to evaluate working memory gains with transcranial direct current stimulation (tDCS) in older adults with mild cognitive impairments (MCI) compared to cognitively healthy control. The proposed study investigates the effects of acute (one-time) tDCS application on working memory gains (i.e., behavior and functional) by evaluating brain structure and cognitive function relationships. tDCS is a method of non-invasive brain stimulation that directly stimulates brain regions involved in active cognitive function and enhances neural plasticity when paired with a training task. A mechanistic, in-scanner, crossover design tDCS study (active and sham stimulation) with 2milliamps (mA) fixed dosing application will enroll 110 participants comprising 55 cognitively normal/healthy older adults and 55 older adults with MCI. The study will employ multi-modal neuroimaging (structural and functional data), person-specific computational models, and machine learning to elucidate acute tDCS effects on working memory. Change in cognitive function (i.e., working memory performance) will be quantified using working memory tasks and magnetic resonance imaging (MRI). The investigators will compare changes in working memory performance resulting from active tDCS versus sham tDCS during 2-back task compared to 0-back task.

The investigators will test the following hypotheses:

  1. Acute tDCS will increase working memory performance during active tDCS and larger degree of brain atrophy seen in MCI patients will significantly decrease current intensity in stimulated brain regions.
  2. Acute tDCS will significantly increase functional connectivity within the working memory network during active tDCS but not sham.

The present study will provide insight into mechanisms underlying tDCS application in MCI population for combating cognitive decline in a rapidly aging population in the United States. Information gathered from this study may guide future intervention strategies to combat cognitive decline and improve the quality of life of aging population.

Study Type

Interventional

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Florida
      • Gainesville, Florida, United States, 32610
        • University of Florida

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Age 60-95 years
  • Montreal Cognitive Assessment (MoCA) score 18 and above (scores will be adjusted for education)
  • Able to receive electrical stimulation
  • Adequate motor capacity to participate in intervention and training sessions

Exclusion Criteria:

  • Contraindications to MRI recording
  • Left-handed
  • Inability to communicate in English
  • History of neurological/psychiatric disorders and traumatic brain injury
  • Incidence of stroke
  • Severe visual and hearing impairment precluding completion of study assessments

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Active tDCS
A neuroConn MR-safe 1x1 tDCS stimulator will be used to apply 12 minutes of 2.0 mA electrical current, with 30 seconds ramps up and 30 seconds ramps down. The electrical current will be applied by using two carbon rubber electrodes (one anode, one cathode) with added ten20 conductive paste. The electrode+paste will be affixed on the participant's scalp over the frontal cortices at F3 and F4 location (EEG 10-20 system). Inflow of current (anode) will occur at F4 location, and outflow of current will occur at F3 (cathode). For each stimulation condition (active, sham), each participant will perform two runs of N-back working memory task (baseline/pre-stimulation and during stimulation). Sham efficacy will be evaluated as a direct comparison in N-back performance and connectivity results in active group versus sham group.
Device: Active tDCS
A neuroConn MR-safe 1x1 tDCS stimulator will be used to apply 12 minutes of 2.0 mA electrical current, with 30 seconds ramps up and 30 seconds ramps down. The electrical current will be applied by using two carbon rubber electrodes (one anode, one cathode) with added ten20 conductive paste. The electrode+paste will be affixed on the participant's scalp over the frontal cortices at F3 and F4 location (EEG 10-20 system). Inflow of current (anode) will occur at F4 location, and outflow of current will occur at F3 (cathode). For each stimulation condition (active, sham), each participant will perform two runs of N-back working memory task (baseline/pre-stimulation and during stimulation). Sham efficacy will be evaluated as a direct comparison in N-back performance and connectivity results in active group versus sham group.
Placebo Comparator: Sham tDCS
Sham stimulation will be performed with the same 1x1 device. Participants will receive 2 mA of direct current stimulation for 30 seconds with 30 seconds ramps up and down. This provides the tingling and prickling sensation on the scalp associated with tDCS while prevent delivering sufficient current (12 minutes) to penetrate the skull and stimulate the brain. Prep in sham conditions will be identical to active stimulation conditions. For each stimulation condition (active, sham), each participant will perform two runs of N-back working memory task (baseline/pre-stimulation and during stimulation). Sham efficacy will be evaluated as a direct comparison in N-back performance and connectivity results in active group versus sham group.
Device: Sham tDCS
Sham stimulation will be performed with the same 1x1 device. Participants will receive 2 mA of direct current stimulation for 30 seconds with 30 seconds ramps up and down. This provides the tingling and prickling sensation on the scalp associated with tDCS while prevent delivering sufficient current (12 minutes) to penetrate the skull and stimulate the brain. Prep in sham conditions will be identical to active stimulation conditions. For each stimulation condition (active, sham), each participant will perform two runs of N-back working memory task (baseline/pre-stimulation and during stimulation). Sham efficacy will be evaluated as a direct comparison in N-back performance and connectivity results in active group versus sham group.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
2-back Working Memory Accuracy
Time Frame: 12 minutes versus 24 minutes in each session. Then comparing active versus sham stimulation sessions, separated by at least two weeks.
The descriptive name of the scale is 2-back Working Memory Accuracy. Participants will perform in-scanner 0 and 2-back (i.e., N-back) working memory task that asks them to acknowledge whether a letter was the same as the letter 2 or N times before. Participant will view one letter at a time, with a crosshair appear briefly as an inter-stimulus interval. The task paradigm for each run consists of four blocks of 2-back and four blocks of 0-back. Two runs (before and during stimulation) will be performed at each visit.
12 minutes versus 24 minutes in each session. Then comparing active versus sham stimulation sessions, separated by at least two weeks.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Florida

Investigators

  • Principal Investigator: Aprinda I Queen, PhD, University of Florida

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

December 1, 2024

Primary Completion (Estimated)

December 1, 2024

Study Completion (Estimated)

December 1, 2024

Study Registration Dates

First Submitted

October 28, 2024

First Submitted That Met QC Criteria

October 28, 2024

First Posted (Actual)

October 30, 2024

Study Record Updates

Last Update Posted (Estimated)

November 21, 2024

Last Update Submitted That Met QC Criteria

November 18, 2024

Last Verified

November 1, 2024

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • IRB202401208

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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