Plural Publishing produces leading academic, scientific and clinical publications in the fields of speech-language pathology, audiology, and otolaryngology.


Otoacoustic Emissions
Principles, Procedures, and Protocols

Sumitrajit Dhar, James W. Hall III
256 pages, Illustrated (B/W), Softcover, 8.5 x 11"
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Otoacoustic emissions now play an important role in hearing screening and the clinical assessment of children and adults. However, a new wave of evidence is challenging our fundamental understanding regarding OAE sources and mechanisms. Similarly, just as we have settled on methods and protocols for clinical uses of otoacoustic emissions, ongoing research suggests new opportunities for evidence-based clinical applications. In Otoacoustic Emissions: Principles, Procedures, and Protocols, Drs. Dhar and Hall have collected the latest information on OAEs – from basic research to clinical applications. The book is concise, but comprehensive, and covers the essentials of the subject from innovative and up-to-date perspectives. The material covered in the book is appropriate for intermediate and advanced students, and ideal for practitioners. With a consistent focus on practical information needed by the clinical audiologist, and a eye to future developments, authors Dhar and Hall systematically raise and answer questions necessary for a thorough understanding of OAEs, and an appreciation of their clinical value.


  • David Kemp, PhD, FRS, Emeritus Professor of Auditory Biophysics, Centre for Auditory Research, The UCL Ear Institute, London, ENT & Audioloy News (July/August 2013):
    "This book offers students and practicing audiologists a comprehensive introduction to the fascinating subject of otoacoustic emissions (OAEs) and their applications. Most other books on OAE (and there are very few) tend to load their text with highly technical research material that can deter the entry level reader, not that this book avoids the essential technicalities, but it gets the level and balance about right...The text is an easy read...liberally illustrated with explanatory diagrams, graphs and large screen prints from actual OAE instruments, all in monochrome...Hall is a hugely experienced and productive educator in the auditory field and Dhar is a real enthusiast for otoacoustic emissions, actively engages in a wide range of clinical and cutting-edge research on the topic. The combination has created the first authoritative entry level text on OAEs which will meet the needs of clinicians, students and instructors. I would give this book a score of 4.5 out of 5."

  • Preface
  • Overview of Otoacoustic Emissions
  • Anatomy, Physiology, Mechanisms, and Theory
    • Outer hair cells are the locus of generation.
    • But where is the nonlinearity, hair bundle or somatic motility?
  • How do emissions return to the ear canal?
    • If there are reflection emissions, what is the reflector?
  • Taxonomy for OAEs: Conventional and Alternative Theories
    • Stimulus based taxonomy
    • Place and wave fixed emissions
    • Nonlinear and reflection emissions
  • Instrumentation and Calibration
    • Current standards (IEC)
    • Calibration at the entrance of the ear canal: advantages and disadvantages
    • How does calibration at the entrance of the canal influence interpretation of results?
    • Alternate strategy for calibrating OAE stimuli
  • Clinical Measurement of OAEs: Procedures and Protocols
  • OAE Analysis (including non-pathologic factors and trouble shooting)
  • Applications of OAEs in Children
  • Applications of OAEs in Adults
  • Suppression of OAEs as a Clinical Tool.
  • New directions in Research and Clinical Application?
  • References
  • Glossary
  • Appendices
    • A. Basic science of OAEs
    • B. Normative data
    • C. Recipe for testing system distortion

About The Authors

Sumitrajit Dhar

Sumitrajit Dhar, PhD, is Professor of Audiology and Hearing Science and Chair of the Roxelyn and Richard Pepper Department of Communication Sciences and Disorders at Northwestern University in Evanston, Illinois. Sumit studied at the University of Mumbai, Utah State University, and Purdue University. At Northwestern University, Sumit teaches courses in the science and practice of audiology. His laboratory works on the origin and propagation of otoacoustic emissions, their clinical applications, and their modulation by the efferent neural network. More recently, his laboratory has also started working on hearing health care design and delivery. Work in Sumit's laboratory has been funded continuously by the National Institutes of Health since 2003. He has also received funding from various foundations and private agencies such as the Knowles Hearing Center, Starkey, American Hearing Research Foundation, American Speech-Language-Hearing Foundation, and Deafness Research Foundation.

James W. Hall III

James W. Hall III, PhD, is an internationally recognized audiologist with 40 years of clinical, teaching, research, and administrative experience. He received a bachelor's degree in biology from American International College, a master's degree in speech pathology from Northwestern University, and his PhD in audiology from Baylor College of Medicine under the direction of James Jerger.

During his career, Dr. Hall has held clinical and academic audiology positions at major medical centers. He is the recipient of numerous professional awards, including the American Academy of Audiology Career Development Award and the AAA Presidential Award. Dr. Hall now holds academic appointments as professor (part-time) at Salus University and the University of Hawaii, numerous adjunct and visiting professor positions, and also Extraordinary Professor at the University of Pretoria in South Africa. He's also president of James W. Hall III Audiology Consulting LLC.

Dr. Hall's major clinical, research, and teaching interests are clinical electrophysiology, auditory processing disorders, tinnitus, hyperacusis, and audiology applications of tele-health. He is available for instruction of Doctor of Audiology students, continuing education of audiologists and physicians, consultation regarding audiology services and procedures, and service as an expert witness. Dr. Hall is the author of over 150 peer-reviewed journal articles, monographs, or book chapters, and nine textbooks including the 2014 Introduction to Audiology Today and the 2015 eHandbook of Auditory Evoked Responses.

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