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Sumitrajit (Sumit) Dhar
Professor; Fellow, Hugh Knowles Center
Communication Sciences & Disorders

Sumitrajit (Sumit) Dhar

Sumit Dhar studies hearing, hearing loss, and hearing healthcare. One major focus of his work is in understanding the physiology and biophysics related to sounds created in the inner ear (otoacoustic emissions). The sounds are recorded using small microphones placed in the ear in an attempt to understand the workings of the inner ear by analyzing them in various ways. He is also keenly interested in using these sounds to detect malfunction of the ear at the earliest. A second major focus is on hearing healthcare delivery. Dhar is interested in understanding why so few people seek hearing health care. Once barriers to access are identified, Dhar’s research group attempts to devise tools and methods to remove these barriers, thereby improving the affordability and accessibility of hearing health care.


Auditory Research Laboratory


PhDHearing Science (minor area Neuroscience), Purdue University
MSAudiology, Utah State University
BScAudiology, University of Bombay

Awards and Honors

2013Clarence Simon Award for Teaching and Mentoring

Recent Publications

L.M. Ferro, G. Tanner, S.F. Erler, K. Erickson, S. Dhar (2007). Comparison of Universal Newborn Hearing Screening Programs in Illinois Hospitals, International Journal of Pediatric Otorhinolaryngology, 217-230.

S. Nordrum, S. Erler, D. Garstecki, S. Dhar (2006). Comparison of performance on the hearing in noise test using directional microphones and digital noise reduction algorithms, American Journal of Audiology, 81-91.

L.A. Shaffer, S. Dhar (2006). DPOAE component estimates and their relationship to hearing thresholds, Journal of the American Academy of Audiology, 279-92.

S. Dhar, G.R. Long, C.L. Talmadge, A. Tubis (2005). The effect of stimulus-frequency ratio on distortion product otoacoustic emission components, Journal of the Acoustic Society of America, 3766-3776.

Grants and Funding

2007 – 2012Reformulating hearing assessment: Translating new discoveries through a large-scale study in the audiology clinic, $3.2M
2004 – 2007Evaluation of DPOAE components in time and frequency domains, NIH/NIDCD, $216,000


CSD 423Evaluation of the peripheral hearing mechanism
CSD 411Evaluation and use of amplification devices