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Amplitude Variation in DPOAE

Rebekah F. Cunningham, PhD

March 27, 2006

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Question

Could you please explain, during a DPOAE test, if I were to leave the probe in a person's ear without taking it out at all, and I ran 3 tests with 5 minutes in between, why would the Absolute Amplitudes vary over time?

Answer

Variations in SPL occur in the ear canal between the probe tip and the TM when the probe is left in the ear over an extended period of time.
These variations in SPL cause amplitude changes in the DPOAE.

In addition, there is an effect of "auditory fatigue" that would occur on repeated measures; this would occur, however, whether the probe was left in the ear between tests or not.

Rebekah Fallis Cunningham, Ph.D. is currently an Assistant Professor in the Department of Audiology at the Arizona School of Health Sciences. She is the Director of Clinical Education at ASHS and instructs residential as well as transitional students in a variety of topics, including OAEs, Evoked Potentials, Pediatric Audiology, Newborn Hearing Screening, Auditory Processing and Cochlear Implants. She has practiced privately and as the coordinator for the pediatric program at a large hospital. She has also worked at a Children's Hospital and a Center for Developmental Delays, where she served as Audiology Director.


rebekah f cunningham

Rebekah F. Cunningham, PhD

Assistant Professor in the Department of Audiology at A. T. Still University, the Arizona School of Health Sciences

Dr. Cunningham is currently an Assistant Professor in the Department of Audiology at A. T. Still University, the Arizona School of Health Sciences (ASHS). She is the Clinical Coordinator at ASHS and instructs residential as well as transitional students in a variety of topics, including OAEs, Evoked Potentials, Pediatric Audiology, Auditory Processing Disorders and Cochlear Implants. She has practiced privately and at several Children's Hospitals, as well as a Center for Developmental Delays, where she served as Audiology Director.  She served for seven years on the American Academy of Audiology (AAA) Task Force on the Early Identification of Hearing Loss in Infants and Young Children. In addition, she served on the AAA Education Committee, chaired the Membership Committee of AAA for 3 years, and is currently on the AAA Board of Directors. Dr. Cunningham has designed, taught, and presented courses, as well as published, on the topics of assessment and management of children with hearing loss.


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