Download Hearing Disorders (Health Alert) by Henry Wouk PDF

By Henry Wouk

This hugely readable and very useful sequence presents younger readers with all they should learn about a number of health conditions.

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Additional resources for Hearing Disorders (Health Alert)

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Antibiotics—Medications that either kill germs or stop them from spreading. audiologist—A person who studies hearing disorders. auditory brain stem response test—A test that measures the brain’s response to sounds. auditory center—The part of the brain that receives sound from the ears and analyzes them. automatic speech recognition (ASR)—The digital transformation of spoken words into text. bacterial meningitis—An infection of tissue in the brain. cerumen—Earwax. cochlea—A spiral cavity inside the head where sound vibrations are turned into nerve impulses.

In ancient Rome, deaf people did not have the full rights of citizens. They could not own property. One religious writer, St. Augustine, declared that parents who had a deaf child were being punished by God. THE SIXTEENTH AND SEVENTEENTH CENTURIES It took centuries before these ideas changed. In the 1500s, an Italian doctor and mathematical genius named Girolamo Cardano became interested in deafness because his oldest son had no hearing in one ear. Cardano experimented with a series of images that he thought could be used to teach the deaf.

The batteries powering them were very big, and the microphone was in a large box that the user would set on the table. As batteries got smaller, so did the hearing aids. By the 1950s, scientists managed to miniaturize the wiring of a hearing aid into tiny electronics packages. Hearing aids were so small that they could be hidden in eyeglasses or worn hooked over the ear. Today’s hearing aids are tiny enough to fit completely inside the ear. Whatever the size, all these hearing aids worked the same way: they made faint sounds louder.

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