Research Labs

Communicative and Assistive Device Laboratory (CADL)

Communication and Assistive Device Laboratory (CADL)


The Communicative and Assistive Device Lab (CADL) studies talk-in-interaction and the interplay between human conversants and their communication teachnologies.  Special attention has been paid to individuals with Complex Communication Needs who use Augmentative Communication Technologies to mediate their social interactions. 

CADL currently collaborates with the Center for Literacy and Disability Studies (UNC - Chapel Hill) on a 5-year grant from the National Institute on Disability, Independent Living and Rehabilitation, Engineering Research.  The purpose of Project OPEN is to:

  • Determine the role of composition delay in creating problems for individuals with CCN and their partners in carrying out in-person interactions
  • Identify the strategies used by participants to stay in-time and/or overcome problems during talk-in-interaction
  • Identify interaction similarities and differences across individuals with ALS, cerebral palsy, and intellectual and developmental disabilities
  • Build a web-based open-source AAC prototype for research and development

Director: Jeff Higginbotham, PhD
Room 106 Cary Hall

Hearing Research Laboratories

Room 137 Cary Hall

Principal Investigators:

  • Richard J. Salvi, PhD
  • Soroush Sadeghi, PhD
  • Bo-Hua Hu, MD, PhD
  • Guang-Di Chen, PhD
  • Dalian Ding, PhD
  • Wei Sun, PhD
  • Kelly Radziwon, PhD
  • Senthilvelan Manohar, PhD
  • Ben Auerbach, PhD
  • Adam Sheppard, PhD

Center for Hearing and Deafness

The Hearing Research Laboratories were originally established in 1988 for the purpose of studying the biological bases of hearing and deafness. The laboratories have expanded and evolved substantially since their inception, and are staffed with faculty, post-doctoral fellows, research associates, and students. The ongoing research is supported by state, federal, and private research grants. The laboratories provide a unique training environment for graduate students interested in hearing research. The laboratories include:

  • Acoustics Laboratory
  • Anatomy Laboratory
  • Audiology Laboratory
  • Physiology Laboratory
  • Cell/Organ Culture Laboratory
  • Evoked Response and Otoacoustic Emissions Laboratory
  • Clinical Hearing Research Lab
  • Molecular Biology Laboratory
  • Psychophysics Laboratory

The directors and staff of these laboratories are core members of the Center for Hearing and Deafness. Visit the Center for Hearing and Deafness for more information on each of these laboratories.

Motor Speech Laboratory

Director: Kris Tjaden, PhD CCC-SLP
Room 108 Cary Hall

The Motor Speech Laboratory in Cary 108 investigates speech production deficits in persons with neurologic impairment, such as Parkinson's Disease and Multiple Sclerosis. The overall aim of this NIH-funded research is to describe the manner in which different types of neurologic lesions or dysarthrias affect speech. We also aim to identify therapeutic techniques most effective for maximizing intelligibility and speech naturalness in dysarthria - and the underlying speech production changes responsible for adjustments in intelligibility and naturalness. Temporal and spectral acoustic measures (i.e., voiceprints or spectrograms) are used to infer processes underlying speech articulation. Our most recent publications focus on how the overlapping of speech sounds - termed "coarticulation" - is affected in dysarthria. Other studies investigate and compare the effects of speech rate reduction, increased vocal loudness, and a faster than normal speech rate on intelligibility in dysarthria.

The lab is equipped with a sound-treated room for on-line recording of speakers, high fidelity microphones, microphone preamplifier, sound level meter, audio filters, and computer workstations equipped with specialized software for acoustic analyses. The laboratory also has equipment for quantifying air pressures and flows generated during speech. The website for the motor speech laboratory can be found here.


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