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The University of Texas at Dallas

Cortical Functions Laboratory

The Cortical Functions Laboratory focuses on the study of Auditory Processing Disorders (APD) in children and adults.

APD is a deficit in the processing of auditory information within the central nervous system. It is believed to be associated with a variety of language-learning problems facing school-aged children, as well as and limitations in the successes experienced by some older adults with traditional amplification.

Still, there is continued disagreement as to the nature of APD, how to best diagnose the problem and how to approach management and remediation. Although behavioral measures continue to be evaluated, we focus on the electrophysiological responses recorded from the surface of the scalp to gain insight as to the potential auditory and non-auditory specific processes involved in APD.

Director  Current students
Location  Publications
Projects    Research participants
Funding   Laboratory meeting dates

Director

Dr. Jeff Martin (curriculum vitae)
Assistant Professor
Callier Advanced Hearing Research Center
1966 Inwood Road
Dallas, TX 75235
Office (214) 905-3078
Fax (214) 905-3146
Lab (214) 905-3041   

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Location

Callier Center Dallas
Callier Advanced Hearing Research Laboratory, J223

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Projects

  • Development of the North American listening in spatialized noise-sentences test (NA LISN-S): Sentence equivalence, normative data and test-retest reliability studies

The object of this research is to standardize the Australian Listening in Spatialized Noise – Sentences test (LISN-S; Cameron & Dillon, 2006) suitable for use in the United States and Canada. 

The LISN-S produces a three-dimensional auditory environment under headphones and was developed to assess auditory stream segregation skills in children.  On this procedure, speech reception thresholds are determined for sentences presented in competing speech maskers. A listener’s performance is measured as the benefit in dB gained when either talker, spatial, or both talker and spatial cues are incorporated in the maskers. 

The LISN-S procedure is currently being investigated in children and young adults, from 12 to 30 years of age, respectively.

  • Dichotic Listening in Children and Adults with Auditory Processing Problems: An Event-Related Potential Study.

Dichotic listening tests (DL) are commonly employed by audiologists for diagnostic evaluation of auditory processing problems in both children and adults.

In this test paradigm, listeners simultaneously receive competing auditory signals; one or more being presented to each ear. When linguistic materials are used, such as words or syllables, a normal test result is that individuals report the information presented to their right ear slightly more accurately than that presented to their left ear (i.e., a right-ear advantage, REA).

For some patients, however, the difference between correct responses on each ear is excessive, usually in the form of a substantial REA, or more appropriately, a substantial left-ear deficit (LED).

Our objective is to gain understanding about the nature of DL deficits in both children and adults evaluated for APD. While DL tests have proven sensitive to the identification of brain abnormalities that affect the auditory system, there are additional factors that can complicate the interpretation of diagnostic test results. Of these, the influence of spatial attention abilities on DL performance has received considerable interest. In this study, we evaluate the hypothesis that declines in attentional and/or executive control may contribute to the observed problems for some individuals on traditional clinical tests of DL.     

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Funding

Faculty Research Initiatives Award, School of Behavioral and Brain Sciences, UT Dallas.
September, 2007. $2,500.00.

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Current Students

Doctorate of Audiology
Lisa Huston
Jason Kwan
Erin Castioni

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Publications

Cameron, S., Brown, D., Keith, R., Martin, J., Watson, C., & Dillon, H.(2009). Development of the North American Listening in Spatialized Noise - Sentences Test (NA LISN-S): Sentence equivalence, normative data and test-retest reliability studies. Journal of the American Academy of Audiology, 20: 128-46.

Mehta, J., Jerger, S., Jerger, J., & Martin, J. (2009). Electrophysiological correlates of word comprehension: Event-related potential (ERP) and independent component analysis (ICA). International Journal of Audiology, 48, 1-11.

Halpern, A., Martin, J. and Reed, T. (2008). An ERP study of major-minor classification in melodies. Music Perception, 25, 181-191.

Martin, J., Jerger, J. and Mehta, J. (2007). Divided-attention and directed-attention listening modes in children with dichotic deficits: an event-related potential study. Journal of the American Academy of Audiology, 18: 34-53.

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Research Participants

Individuals interested in participating in our research are encouraged to contact the laboratory directly at 214-905-3104.

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Laboratory Meeting Dates

Announced each semester. Currently meets on Thursdays from 9:45 a.m.-11 a.m.

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