Hearing impairment
hideA hearing impairment or deafness is a full or partial decrease in the ability to detect or understand sounds. Caused by a wide range of biological and environmental factors, loss of hearing can happen to any organism that perceives sound. "Hearing impaired" is often used to refer to those who are deaf, although the term is viewed negatively by members of Deaf culture, who prefer the terms "Deaf" and "Hard of Hearing".
Sound waves vary in amplitude and in frequency. Amplitude is the sound wave's peak pressure variation. Frequency is the number of cycles per second of a sinusoidal component of a sound wave. Loss of the ability to detect some frequencies, or to detect low-amplitude sounds that an organism naturally detects, is a hearing impairment.
For more information about Hearing impairment, read the full article at
Wikipedia.
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News tagged with hearing loss
Elusive protein points to mechanism behind hearing loss
Medicine & Health / Neuroscience
Dec 08, 2009 |
5 / 5 (1) |
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(PhysOrg.com) -- A serendipitous discovery of deaf zebra fish larvae has helped narrow down the function of an elusive protein necessary for hearing and balance. The work, led by Rockefeller University’s A. ...
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Scientists set their sights on hearing breakthrough for babies
7 hours ago |
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(PhysOrg.com) -- The first year to two years of life is a critical time for hearing impaired children and their language development. Whilst young babies with hearing difficulties can now be fitted with cochlear ...
Staying Power: Senate Hearing Focuses On Energy Storage
Dec 10, 2009 |
3.4 / 5 (7) |
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Thursday's Senate Energy and Natural Resources Committee hearing featured testimony from experts about the power industry's need to develop systems capable of storing large amounts of electricity if the nation's ...
Moderate weight loss in obese people improves heart function
10 hours ago |
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Obese patients who lost a moderate amount of weight by eating less and exercising more improved their cardiovascular health, says a study at Washington University School of Medicine in St. Louis.
Gov't misconduct may unravel Broadcom fraud case
14 hours ago |
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(AP) -- When the federal government revealed it had launched a massive investigation of some of Broadcom Corp.'s top executives for backdating stock options, it sent a shock wave through the business world.
Earliest toothless bird found
Other Sciences / Archaeology & Fossils
Dec 10, 2009 |
4.8 / 5 (5) |
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(PhysOrg.com) -- A new species of bird from the Cretaceous period in China has been identified. It had toothless upper and lower jaws, and provides significant information on the diversification in the evolution ...
New inherited eye disease discovered
11 hours ago |
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University of Iowa researchers have found the existence of a new, rare inherited retinal disease. Now the search is on to find the genetic cause, which investigators hope will increase understanding of more ...
Irregular arm swing may point to Parkinson's disease
Dec 10, 2009 |
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Irregular arm swings while walking could be an early sign of Parkinson's disease, according to neurologists who believe early detection may help physicians apply treatments to slow further brain cell damage until strategies ...
Successful stem cell therapy for treatment of eye disease
Dec 10, 2009 |
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Newly published research, by investigators, at the North East England Stem Cell Institute (NESCI) in the journal Stem Cells reported the first successful treatment of eight patients with "Limbal Stem Cell Deficiency" (LSCD) ...
Health care loophole would allow coverage limits
14 hours ago |
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(AP) -- A loophole in the Senate health care bill would let insurers place annual dollar limits on medical care for people struggling with costly illnesses such as cancer, prompting a rebuke from patient ...
DNA study sheds new light on horse evolution
Dec 10, 2009 |
5 / 5 (2) |
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(PhysOrg.com) -- Ancient DNA retrieved from extinct horse species from around the world has challenged one of the textbook examples of evolution - the fossil record of the horse family Equidae over the past ...
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