To understand how tinnitus works, you first have to understand how your brain hears sounds. This rare type can be caused by blood flow issues, brain tumors or other brain abnormalities. An example of this is pulsatile tinnitus, which sounds like a rhythmic pulsing in the ear that is in sync with your heartbeat. Objective tinnitus is when the doctor can hear the noise during an examination. This is the most common of the two types. Subjective tinnitus is when only you can hear the noise. There are two types: subjective and objective. According to the American Tinnitus Association, nearly 50 million Americans suffer from tinnitus. These sounds often make it difficult to concentrate or hear other sounds that are present. Tinnitus is when someone hears internal noise (usually a ringing sound), even though no other external sounds are present. What is Tinnitus?įirst, tinnitus is not a condition or disease it is a symptom of an underlying cause. You now might be asking yourself “what is tinnitus? Is it treatable? How did I get it?” Hopefully, we can help shed some light on these questions and concerns. If you do, you might be suffering from tinnitus. “Our calculations and experiments are consistent with how observers have described the concurrent sounds associated with fireballs,” they conclude.Do you often hear ringing in your ears? Maybe it's more like a buzzing or roaring sound. They were able to measure faint sounds, “similar in loudness to rustling leaves or faint whispers.” To test their theory, the Sandia researchers exposed several materials, including several types of dark cloth and a synthetic brown wig, to rapidly pulsing light equivalent to what a fireball would produce. The so-called photoacoustic effect-light converted to sound-was observed as long ago as 1880, by Alexander Graham Bell. Also, hair has a large surface-to-volume radio, which maximizes sound creation.” Hair near the ears will create localized sound pressure, so it is likely to be heard. “Intuitively, frizzy hair should be a good transducer for two reasons. “It seems significant that people with frizzy hair are reported to be more likely to hear concurrent sound from meteors,” write the authors. And some materials-leaves, grass, dark clothing and paint, fine hair-make better transducers than others. It only happens with fireballs brighter than -12 magnitude, or about the brightness of the full moon. can then manifest as sound to a nearby observer.” In a study published online last week in Scientific Reports, they propose that very brief pulses of bright light associated with fireballs can heat the surfaces of certain transducing (able to convert energy from one form to another) materials, which then “rapidly warm and conduct heat into the nearby air, generating pressure waves. Now a team led by Richard Spalding at the Sandia National Labs thinks they have the mystery figured out. Nininger, who thought the sounds should be regarded ‘as a problem in physics rather than psychology.’ ” “One of the few to object was American meteoriticist H.H. Well into the 20 th century, the sounds accompanying meteorite falls were considered auditory illusions and dismissed as the products of “affrighted imaginations,” according to Golia. “Gregory of Tours in AD 580 recorded ‘a sound of as many trees crashing to the ground’ Chinese annals (AD 817) note ‘a noise like a flock of cranes in flight’ whereas witnesses of the Peekskill, New York fireball of 1992 heard something ‘like a sparkler.’ Reports from different times and places mention ‘swishing,’ ‘rushing,’ ‘popping,’ ‘buzzing,’ ‘crackling’ or ‘vibrating’ in the air.” “Cultural factors clearly influenced the way people interpreted the auditory experience,” writes Maria Golia in her 2015 book Meteorite: Nature and Culture. The sounds occur while the meteor is flashing across the sky, and are separate from the sonic boom sometimes heard seconds after the fireball is extinguished. The brighter ones, called fireballs, put on spectacular light shows. Tens of thousands of meteorites hurtle toward Earth each day, breaking apart as they enter the atmosphere. Earlier this week, a gigantic green fireball was spotted over the Midwest, with sightings reported all the way from Missouri to New York.
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