The Communication in Adults Research Group (CARG) is a consortium of three research labs involved in different aspects of communication in aging populations or individuals with neurological communication disorders. CARG is located at the Lake Austin Centre and is under the auspices of the Department of Communication Sciences and Disorders at The University of Texas at Austin.

Mission Statement

The common goals of this group are to:

  • Increase knowledge of various aspects of communication in normal aging, aphasia, and Alzheimer's disease.
  • Involve normal elderly individuals in various research experiments pertaining to aging.
  • Facilitate interdisciplinary and inter-institutional collaboration in adult normal and disordered communication research.
  • Provide speech and language pathology clinicians updated research information about current diagnostic and treatment issues pertaining to normal and disordered aging.
  • Provide research opportunities for graduate students interested in various aspects of communication in normal aging, aphasia, and Alzheimer's disease.

Research Laboratories

The following topics are researched in our laboratories:

  • Speech Motor Control and Emotional Processing

(Principal Investigator: Thomas Marquardt)

Participant Registry

Adults of all ages are encouraged to participate in our studies. Compensation may be available for participants. Individuals with normal communication and memory and those with difficulties are welcome to participate.

For us to determine your eligibility for various studies and to enlist in our participant registry, please email us at or reach us by phone at (512) 475-7046.

Austin Area Community Events:

Brain Injury Association of Texas- Austin Chapter meeting
Mary Lee Foundation Community Center, 1327 Lamar Square Drive Austin, TX
Meetings are held the first Tuesday of each month from 7:00 to 8:30 pm
Contact Ruthann Curtis at: 512.324.7894 BIATx Austin, 512.453.1344 Work, 512.453.8580 Fax,

Brain Tumor Support Group
HealthSouth Rehabilitation Hospital, 1215 Red River Street, Austin, TX 78701
Meetings are held the second Thursday of each month. Contact Olga Torres at 512.479.3509.

Capital Area Parkinson's Society
Patient and Caregiver support group Meets in McFadden Auditorium at Seton Hospital on 38th Street.
Contact the Capital Area Parkinson’s Society at: 512.459.9876, 512.303.2536 or

River City Stroke/Aphasia Club
McBeth Recreation Center, 2401 Columbus Drive, Austin, TX 78746
Meetings are held every Thursday from 10:30 am to Noon. Contact Christy Moreland at: 512.327.6498 or 512.327.6585 Fax
Group Leader: Thomas P. Marquardt, Ph.D., CCC-SLP

Stroke Survivor and Caregiver Support Group
Meets at HealthSouth Rehab Hospital of Austin, Cafeteria Annex, 1215 Red River Street. Meetings are held the fourth Thursday of each month from 6:30 to 8:00 pm
Instructor: Pamela Fletcher OTR Call 512.479.3564 to register


Thomas Marquardt, Ph.D., CCC-SLP

Thomas Marquardt teaches courses in aphasia, dysarthria, differential diagnosis of communication disorders, and introduction to communication sciences and disorders. Dr. Marquardt's primary research interests are in developmental and acquired apraxia of speech and differential diagnosis of speech and language disorders subsequent to brain damage. Dr. Marquardt is currently the Director and Principal Investigator of the Speech Motor Control and Emotional Processing Laboratory. The author of Neurogenic Communication Disorders and co-author of Appraisal and Diagnosis of Speech and Language Disorders, he has published articles in the Journal of Speech and Hearing Research, Cortex, and Brain and Language on topics such as compensatory articulation in Broca's aphasia, the effects of linguistic factors on speech errors in acquired apraxia, syntax in developmental apraxia, and intelligibility of voice output communication aids. From 1982-1988, he served as Director of the Program in Communication Disorders (now Department of Communication Sciences and Disorders). Dr. Marquardt was recently inducted as an ASHA Fellow.


Dan Harris, Ph.D., CCC-A/SLP

Dan Harris has been an adjunct assistant professor of speech-language pathology and audiology at U.T. Austin since 1988. His activities in the Department of Communication Sciences and Disorders have included teaching graduate courses, supervising students in clinical practica, participating in research projects with department faculty, and serving on doctoral and master’s thesis committees. He has been involved in the publication of over 35 research articles and has authored book chapters on central auditory processing disorders in children and auditory evoked potentials in rehabilitation of patients with brain injuries. Presently, he practices clinical audiology at Adult Care of Austin, providing hearing and balance diagnostics, as well as hearing aid fittings. Also, he currently provides speech pathology services at South Austin Hospital for acute-care patients with a variety of communication and swallowing disorders.