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This article from sciencedaily.com shows us that extended use of loud personal music players can  decrease our ability to hear in noisy environments even though your audiogram (hearing test) may be normal.

 

ScienceDaily (Mar. 10, 2011) — Growing numbers of people enjoy listening to music on portable music players or cell phones, and many tend to turn up the volume, especially in noisy surroundings. In a study published March 2, 2011 in the open-access journalPLoS ONE, researchers explore the potential effects of this behavior on hearing.

Growing numbers of people enjoy listening to music on portable music players or cell phones, and many tend to turn up the volume, especially in noisy surroundings. In a study published March 2, 2011 in the open-access journalPLoS ONE, researchers explore the potential effects of this behavior on hearing.

The study was a collaboration between Drs. Hidehiko Okamoto and Ryusuke Kakigi from the National Institute for Physiological Sciences, Japan, and Drs. Christo Pantev and Henning Teismann from the University of Muenster. The researchers demonstrated that listening to loud music through earphones for extended periods in noisy surroundings can cause neurophysiological changes related to clear discrimination of sounds, even if the hearing threshold is normal. This auditory abnormality concerns “the vividness of sounds” and cannot be recognized by the usual hearing test in which subjects are examined using a series of individual tones in a silent environment. These results may support a future auditory assessment plan for long-term portable music player users.

The research group examined the brain’s response to sound using the biomagnetism measurement device MEG (magnetoencephalography), which makes it possible to measure the brain activity without any subject’s behavioral response. They recorded the brain responses of two groups of 13 young adults; one group had regularly listened to music at full blast, and the other group had not. Subjects listened to a sound of a specific frequency contained in background noises while watching a movie. The inability to dissociate a sound from background noises was considerably more pronounced in the habitual portable music player users. This difficulty cannot be detected with the current standard hearing test, which yielded the same results in both groups.

According to Dr. Okamoto, “It can be said that listening to music at high volumes burdens the nerves of the brain and auditory system and can cause a decline in the ability to discriminate sounds, even if the usual hearing test results are normal and the subject is unaware of any changes.” He also claims, “It would be better to suppress environmental noises by using devices such as noise cancellers instead of turning up the volume when enjoying a mobile music player in a noisy place.”

 

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Jan. 5, 2010 – It is well known that humans naturally process facial expression along with what is being heard to fully understand what is being communicated. The UBC study is the first to show we also naturally process tactile information to perceive sounds of speech.

Prof. Bryan Gick of UBC’s Dept. of Linguistics, along with PhD student Donald Derrick, found that air puffs directed at skin can bias perception of spoken syllables. “This study suggests we are much better at using tactile information than was previously thought,” says Gick, also a member of Haskins Laboratories, an affiliate of Yale University.

The study, published in Nature November 26, offers findings that may be applied to telecommunications, speech science and hearing aid technology.

English speakers use aspiration — the tiny bursts of breath accompanying speech sounds — to distinguish sounds such as “pa” and “ta” from unaspirated sounds such as “ba” and “da.” Study participants heard eight repetitions of these four syllables while inaudible air puffs — simulating aspiration — were directed at the back of the hand or the neck.

When the subjects — 66 men and women — were asked to distinguish the syllables, it was found that syllables heard simultaneously with air puffs were more likely to be perceived as aspirated, causing the subjects to mishear “ba” as the aspirated “pa” and “da” as the aspirated “ta.” The brain associated the air puffs felt on skin with aspirated syllables, interfering with perception of what was actually heard.

It is unlikely aspirations are felt on the skin, say the researchers. The phenomenon is more likely analogous to lip-reading where the brain’s auditory cortex area activates when the eyes see lips move, signaling speech. From the brain’s point of view, you are “hearing” with your eyes.

“Our study shows we can do the same with our skin, “hearing” a puff of air, regardless of whether it got to our brains through our ears or our skin,” says Gick.

Future research may include studies of how audio, visual and tactile information interact to form the basis of a new multi-sensory speech perception paradigm. Additional studies may examine how many kinds of speech sounds are affected by air flow, offering important information about how people interact with their physical environment.

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Every day, almost 140 million Americans experience noise levels that the U.S. Environmental Protection Agency (EPA) categorizes as “annoying
or disruptive.”(xiv) Karen A. Bilich writes that children “are especially vulnerable to noise induced hearing loss – which often happens gradually and without pain – from overexposure to noise.”(xv) Almost 15 percent of children ages 6 to 17 show signs of hearing loss, according to a 1998 study published in the Journal of the American Medical Association. However, at this time there are no federal regulations in the United States that limit the noise levels of toys. The European standard is inadequate because it sets the sound threshold too high at 115 decibels, at which an exposure of less than 30 seconds can cause hearing loss. The Occupational Safety and Health Administration (OSHA) reports that prolonged exposure to sounds at 85 decibels or higher can result in hearing damage (xvi). The American Academy of Pediatrics and the National Campaign for Hearing Health also use 85 decibels as a threshold for dangerous levels of noise. The National Campaign for Hearing Health, in its Toxic Noise Guidelines, lists the following relationships between decibel levels and times of exposure (xvii):

• 85 decibels: Exposure over an 8-hour period risks hearing loss.
• 90 decibels: Exposure for 2 hours risks hearing loss.
• 97 decibels: Exposure for 30 minutes risks hearing loss.
• 100 decibels: Exposure for 15 minutes risks hearing loss.
• 110 decibels: Exposure for less than 2 minutes risks hearing loss
• 120 decibels: Exposure less than 30 seconds risks hearing loss.
• 130 decibels: Any exposure risks permanent hearing loss.

Standards for Loud Toys
As of November 2003, The American Society for Testing Materials (ASTM) finalized specifications for sound-producing toys that include (1) limiting the sound pressure level of hand-held, table-top and crib toys to a level not to exceed 90dB when measured from a distance of 25 centimeters; (2) limiting the sound pressure level of close-to-the-ear toys to a level not to exceed 70dB when measured from a distance of 25 centimeters; (3) limiting the sound pressure level of toys with impact-type impulsive sounds to a level not to exceed 120dB when measured from a distance of 25 centimeters; (4) limiting the sound pressure level of toys with explosive-type impulsive sounds to a level not to exceed 138dB when measured from a distance of 25 centimeters.

There are numerous exceptions to the standards(xviii) and the standards are voluntary. The standards, while a solid step in the right direction, are flawed (xix) and should be strengthened and stronger standards should be enforced by the CPSC.

This year, NYPIRG researchers identified numerous toys that were dangerously loud. For example, a surveyor identified a toy called “Learn Through Music” manufactured by Fisher Price that produces noise at 102dB at 10 centimeters and 92dB at 25 centimeters.

Fisher Price’s “Learn Through Music” is a dangerously loud toy targeted to very young children

Recommendations

To protect children from dangerously loud toys, NYPIRG supports the recommendations of the League for the Hard of Hearing: (1) If a toy sounds too loud for you in the store, don’t buy it. Children are even more sensitive to sound than adults. (2) Put tape over the speakers of any toys you already own that are too loud. This will reduce the noise levels of the toys. (3) Remove the batteries from loud toys. (4) Report a loud toy to the CPSC.

CPSC should: (1) Enforce the new ASTM standards to the fullest extent. (2) Consider strengthening the standards to be more protective of children’s delicate ears. Specifically, CPSC should consider lowering the threshold for hand-held toys from 90 dB to no higher than 85 dB.

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Classic use of irony.

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Hello everyone!

This is the first video of a series of hearing aid reviews designed to assist the hearing aid prospect into finding the right hearing aid for their hearing loss.  We  will assess several aspects and important factors in purchasing a hearing device.  Come check us out and help us spread the word!

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Washington D.C.  (July) – The AG Bell Leadership Opportunities for Teens (LOFT) program wrapped up four days of whirlwind activities in Washington, D.C., which included panel exercises with local dignitaries, a tour of the White House, a ROPES course adventure and a special presentation at the U.S. Capitol. Finally, the 20 teens between the ages of 15 and 18 who are deaf or hard of hearing and use spoken language were treated to a closing night reception at The Volta Bureau, AG Bell headquarters in Washington, D.C.

LOFTimg6In observing LOFT, AG Bell’s Executive Director Alexander T. Graham commented that it reminded him of the C.S. Lewis quote, “Friendship is born at that moment when one person says to another, ‘What! You too? I thought I was the only one.’” Graham

continued that while White House tours and meetings in U.S. Capitol are likely to leave a lasting impression on these future leaders, “Nothing is more important than the friendships made during their four days in Washington, D.C. That’s what LOFT is all about—peers coming together.” The 2009 LOFT program is the kick-off AG Bell’s reinvestment in youth and family programming. Revised and new programs for parents and college-age adults are also underway.

AG Bell would like to especially thank its lead sponsors, Oticon and National Technical Institute for the Deaf (NTID), as well as the MaxLOFTimg1 and Victoria Dreyfus Foundation and the Tenenbaum Family Foundation, for their support of this year’s program. Appreciation and thanks go to the volunteers that generously donated their time and expertise in their respective fields to help put on a fabulous program:

  • Al Hunt, noted political commentator, Bloomberg News
  • Varissa McMickens, Executive Director, D.C. Arts and Humanities Education Collaborative
  • Rhona Friedman, Vice Chair, D.C. Commission on the Arts and Humanities
  • Ingrida Lusis, Director of Federal and Political Advocacy for the American Speech-Language-Hearing Association
  • Dr. I. King Jordan, President Emeritus, Gallaudet University
  • Karen Peltz Strauss, co-founder, Coalition of Associations for Accessible Technology
  • Rachel Dubin, member, AG Bell Public Affairs Council
  • Josh Swiller, bestselling author and Visiting Professor, Gallaudet University

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