Treating Primary Progressive Aphasia (PPA) Using High-definition tDCS

Treating Primary Progressive Aphasia (PPA) and Elucidating Neurodegeneration in the Language Network Using Transcranial Direct Current Stimulation (tDCS)

This is a double-blind, sham-controlled, crossover study in which subjects with the non-fluent/agrammatic and logopenic variants of primary progressive aphasia (naPPA and lvPPA, respectively) will undergo language testing and structural and functional brain imaging before and after receiving 10 semi-consecutive daily sessions of real or sham high-definition transcranial direct current stimulation (HD-tDCS) paired with modified constraint-induced language therapy (mCILT). Language testing and brain imaging will be repeated immediately after completion of and 3 months following completion of treatment. The 3-month follow-up will be the primary endpoint. The investigators will examine changes in language performance induced by HD-tDCS + mCILT compared to sham HD-tDCS + mCILT. The investigators will also use network science to analyze brain imaging (fMRI) data to identify network properties associated with baseline PPA severity and tDCS-induced changes in performance. This study will combine knowledge gained from our behavioral, imaging, and network data in order to determine the relative degrees to which these properties predict whether persons with PPA will respond to intervention.

Study Overview

• Status: Completed
• Conditions: Primary Progressive Aphasia
• Intervention / Treatment: Device: high-definition transcranial direct current stimulation; Behavioral: modified constraint-induced language therapy

Detailed Description

The central framework for the project is a double-blind, sham-controlled, crossover study in which subjects with the non-fluent/agrammatic and logopenic variants of primary progressive aphasia (naPPA and lvPPA, respectively) will undergo language testing and structural and functional brain imaging before and after receiving 10 semi-consecutive daily sessions of real or sham high definition transcranial direct current stimulation (HD-tDCS) paired with modified constraint-induced language therapy (mCILT). Language testing and brain imaging will be repeated immediately after completion of and 3 months following completion of treatment.

Subjects with naPPA and lvPPA will be randomized to one of two study arms: HD-tDCS+mCILT or sham stimulation+mCILT paired with pre- and post-stimulation imaging and behavioral measures. Equal numbers of subjects with naPPA and lvPPA will be randomized to the HD-tDCS + mCILT and sham + mCILT study arms. The study is double-blinded, in that neither the subject nor the study personnel administering HD-tDCS or sham stimulation will know which arm of the study the subject has been randomized into. Study coordinators will administer HD-tDCS by entering a pre-determined code that has been programmed into the device by another member of the study team. Data will be digitally audio-recorded and analyzed off-line, such that study team members performing data coding and analysis will likewise be blinded to the treatment condition of each subject.

Subject participation in this protocol will occur during 27 planned visits that will span approximately 8 months. The events of the study visits are described below:

VISIT 1:

a Informed consent and screening b. Baseline language assessment #1 c. Baseline MRI scanning

VISIT 2:

Baseline language assessment #2

VISITS 3-11:

HD-tDCS+mCILT OR sham stimulation+mCILT, depending on the study arm to which they had been randomized.

VISIT 12:

1. Final session of HD-tDCS+mCILT or sham stimulation+mCILT
2. Follow-up language assessment
3. Follow-up MRI

VISIT 13:

6-Week follow-up language assessment

VISIT 14:

1. 12-week follow-up language assessment
2. 12-week follow-up MRI

**CROSSOVER**

VISIT 15:

Crossover baseline language assessment #2

VISITS 16-24:

HD-tDCS+mCILT or sham stimulation+mCILT

VISIT 25:

1. 10th session of HD-tDCS+mCILT or sham stimulation+mCILT
2. Follow-up language assessment
3. Follow-up MRI

VISIT 26:

6 Week follow-up language assessment:

VISIT 27:

1. 12-week follow-up language assessment
2. 12-week follow-up MRI

• Study Type: Interventional
• Enrollment (Actual): 76
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • Pennsylvania
    • Philadelphia, Pennsylvania, United States, 19104
      • University of Pennsylvania

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 45 years to 80 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Presence of aphasia attributable to nonfluent agrammatic PPA (naPPA) or logopenic variant PPA (lvPPA)
2. High school education (or more)
3. Must be able to understand the nature of the study, and give informed consent
4. Native English speaker

Exclusion Criteria:

• Presence of additional neurological illness such as stroke or traumatic brain injury
• Diagnosis of epilepsy or reoccurening seizures
• Pacemaker or ICDs
• Craniotomy or skull breech
• Small vessel disease

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: HD-tDCS+mCILT; Participants will undergo 10 daily sessions (Monday-Friday, x2 weeks) of HD-tDCS for 20 minutes using a montage in which a central electrode (1.5mA) is placed over the left frontotemporal area and four surrounding cathodes (.375mA each). Subjects will participate in a modified constraint-induced language therapy.	Device: high-definition transcranial direct current stimulation; High definition transcranial direct current stimulation (HD-tDCS) involves the application of low-intensity current through electrodes placed on the scalp. It is believed to elicit brain effects by producing incremental shifts in the resting membrane potential of large numbers of neurons, which alters neuronal firing rates and thus modulates patterns of brain activity in potentially behaviorally-relevant ways. HD-tDCS differs from conventional transcranial direct current stimulation (tDCS) because it employed smaller electrodes configured in such a way as to deliver more focal stimulation of the brain.; Behavioral: modified constraint-induced language therapy; Modified constraint-induced language therapy (mCILT) is a behavioral language therapy that invokes use-dependent learning in communicative interactions by requiring spoken output and restricting use of alternative forms of communication, such as gestures, as a substitute for spoken output. Other key elements of CILT include massed practice of goal-directed speech and shaping of desired responses by increasing response demands as participants improve. MCILT differs from traditional constraint-induced language therapy (CILT) in three ways: 1) it will be done as an individual therapy with the examiner in the role of a communication partner; 2) treatment will be delivered in short sessions (1 hour rather than a more typical 3-4 hour session); 3) targeting nouns + semantically related verbs to generate noun + verb phrases in treatment, a modification that may be better suited to addressing syntactic structure.
Sham Comparator: Sham+mCILT; Participants will undergo 10 daily sessions (Monday-Friday, x2 weeks) of sham for 20 minutes using a montage in which a central electrode is placed over the left frontotemporal area and four surrounding cathodes. Subjects will participate in a modified constraint-induced language therapy,	Device: high-definition transcranial direct current stimulation; High definition transcranial direct current stimulation (HD-tDCS) involves the application of low-intensity current through electrodes placed on the scalp. It is believed to elicit brain effects by producing incremental shifts in the resting membrane potential of large numbers of neurons, which alters neuronal firing rates and thus modulates patterns of brain activity in potentially behaviorally-relevant ways. HD-tDCS differs from conventional transcranial direct current stimulation (tDCS) because it employed smaller electrodes configured in such a way as to deliver more focal stimulation of the brain.; Behavioral: modified constraint-induced language therapy; Modified constraint-induced language therapy (mCILT) is a behavioral language therapy that invokes use-dependent learning in communicative interactions by requiring spoken output and restricting use of alternative forms of communication, such as gestures, as a substitute for spoken output. Other key elements of CILT include massed practice of goal-directed speech and shaping of desired responses by increasing response demands as participants improve. MCILT differs from traditional constraint-induced language therapy (CILT) in three ways: 1) it will be done as an individual therapy with the examiner in the role of a communication partner; 2) treatment will be delivered in short sessions (1 hour rather than a more typical 3-4 hour session); 3) targeting nouns + semantically related verbs to generate noun + verb phrases in treatment, a modification that may be better suited to addressing syntactic structure.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in Western Aphasia Battery Aphasia Quotient (WAB-AQ)	The primary outcome measure will be the change in score on the WAB-AQ, a score assessing overall aphasia recovery. Scores can range from 0-100. 0-25 is very severe, 26-50 is severe, 51-75 is moderate, and 76-above is mild. A score of 93 or higher is considered recovered.	Baseline, 2 weeks, 6 weeks, 12 weeks, 14 weeks, 18 weeks, 24 weeks

Collaborators and Investigators

• Sponsor: University of Pennsylvania
• Investigators: Principal Investigator: Roy H Hamilton, MD, University of Pennsylvania

Study record dates

Study Major Dates

• Study Start (Actual): August 17, 2020
• Primary Completion (Actual): June 30, 2025
• Study Completion (Actual): June 30, 2025

Study Registration Dates

• First Submitted: July 12, 2019
• First Submitted That Met QC Criteria: August 5, 2019
• First Posted (Actual): August 6, 2019

Study Record Updates

• Last Update Posted (Estimated): October 15, 2025
• Last Update Submitted That Met QC Criteria: October 10, 2025
• Last Verified: October 1, 2025

More Information

Terms related to this study

• Keywords: aphasia; non-invasive brain stimulation; transcranial direct current stimulation (tDCS)
• Additional Relevant MeSH Terms: Neurologic Manifestations; Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Mental Disorders; Neurobehavioral Manifestations; Neurocognitive Disorders; Dementia; Communication Disorders; Language Disorders; Speech Disorders; Pathological Conditions, Signs and Symptoms; Signs and Symptoms; Aphasia; Aphasia, Primary Progressive
• Other Study ID Numbers: 834650

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