Popelka, Gerald R. Head of Audiology, Research Laboratories, Central Institute for the Deaf, St. Louis, Missouri.
Last reviewed:March 2019
Show previous versions
- Conductive abnormalities
- Sensorineural abnormalities
- Central nervous system abnormalities
- Nature of hearing impairment
- Treatment and management
- Cochlear implants
- Hearing aids
- Links to Primary Literature
- Additional Readings
Any alteration of hearing capacity. Hearing comprises the general perceptual behavior and the specific responses that are made in relation to sound stimuli. Any deterioration or defect concerning the ability to hear (Fig. 1) is termed hearing impairment or hearing loss. Hearing impairment can be of various degrees, including mild, moderate, severe, profound, or total. Typically, the degree of impairment is categorized by the loss of hearing sensitivity, that is, how loud sounds must be for a listener to hear them. The degree of impairment can refer either to the loss of hearing sensitivity for individual pitches of sounds for each ear separately or to an overall loss of hearing sensitivity for both ears. Hearing impairment is further categorized as unilateral if present in only one ear and as bilateral if present in both ears. See also: Ear (vertebrate); Hearing (human); Loudness; Pitch; Sound
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information