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T he Teen Buzz ultrasonic ringtones were created by teenagers so that they could be alerted to incoming text messages or calls on their cell phones without nearby adults becoming aware of it. These "secret ringtones" take advantage of the fact that as people age, they lose some of their hearing sensitivity, especially in the higher frequencies. So a high-frequency tone that is at the edge of audibility for most teenagers will be inaudible to many adults over age 20, and to most adults over the age of

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A couple of weeks ago, my wife and I went to the circus together. Someday, I vowed, I'll be strong, flexible, and stable enough to do the amazing hand-balancing tricks we saw. And all the while, the six-year-old girl behind us screamed her piercing, high-pitched scream, cheering the performers on.

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The functioning of the inner ear is at least temporarily altered by exposure to low-frequency sounds. A wind turbine, a roaring crowd at a football game, a jet engine running full throttle: Each of these things produces sound waves that are well below the frequencies humans can hear. Listening to just 90 seconds of low-frequency sound can change the way your inner ear works for minutes after the noise ends, a new study shows.

Introduction Ever wonder why some adults experience trouble with hearing as they get older? Hearing loss tends to become more severe as we age. But does hearing loss cause everything to sound uniformly softer or do certain sounds become harder to hear than others?

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Hearing range describes the range of frequencies that can be heard by humans or other animals, though it can also refer to the range of levels. Sensitivity also varies with frequency, as shown by equal-loudness contours. Routine investigation for hearing loss usually involves an audiogram which shows threshold levels relative to a normal.

Check your hearing with a list of tones that go from 8Hz all the way up to 22,Hz. This online test will help you find out where your high frequency hearing cuts off. Even just listening to an iPod for an extended period of time can permanently damage your hearing.

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Think you have perfect hearing? The low range of human hearing starts around 20 hertz, and tops out at about 20, [ PDF ]. By contrast, bats can hear ultrasonic sounds with frequencies up tohertz. Other animals, like elephants, hear sounds many times lower than those a human can perceive.

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The ear is an amazing body part because it enables humans and animals to hear what goes on around them. Hearing is one of the five senses of the body. The ears help the body to pick up sound waves and vibrations.

Free Mosquito Ringtones. The Mosquito Ringtone came about after a crafty British man who invented a device called The Mosquito, the Mosquito is a device that emits a very high frequency tone meant to annoy teenagers adults are unable to hear the tone. Some crafty students decided to convert the same technology into a ring tone that only they teenagers could hear!


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