Argumentative essay about bridging the gap

argumentative essay about bridging the gap

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This accounts for around 30 of deaf individuals who are deaf from a genetic standpoint. 42 Nonsyndromic deafness occurs when there are no other signs or medical problems associated with an individual other than deafness. From a genetic standpoint, this accounts for the other 70 of cases, and represents the majority of hereditary hearing loss. 42 Syndromic cases occur with diseases such as Usher syndrome, stickler syndrome, waardenburg syndrome, alport's syndrome, and neurofibromatosis type. These are diseases that have deafness as one of the symptoms or as a common feature associated with. Many of the genetic mutations giving rise to syndromic deafness have been identified. In nonsyndromic cases, where deafness is the only finding, it is more difficult to identify the genetic mutation although some have been discovered.

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People living in preindustrial societies have considerably less hearing loss than similar populations living in modern society. Among primitive people who have migrated into modern society, hearing loss is proportional to the number of years spent in modern society. Military service in World War ii, the korean War, and the vietnam War, has likely also caused hearing loss in large numbers of men from those generations, though proving that hearing loss was a direct result of military service is problematic without entry and exit. 39 hearing loss in adolescents may with be caused by loud noise from toys, music by headphones, and concerts or events. 40 In 2017, the centers for Disease control and Prevention brought their researchers together with experts from the world health Organization and academia to examine the risk of hearing loss from excessive noise exposure in and outside the workplace in different age groups, as well. A summary report was published in 2018. 41 Genetic edit hearing loss can be inherited. Around 7580 of all these cases are inherited by recessive genes, 2025 are inherited by dominant genes, 12 are inherited by x-linked patterns, and fewer than 1 are inherited by mitochondrial inheritance. 42 When looking at the genetics of deafness, there are 2 different forms, syndromic and nonsyndromic. Syndromic deafness occurs when there are other signs or medical problems aside from deafness in an individual.

If one is exposed to loud sound database (including music) at high levels or for extended durations (85 db a or greater then hearing loss will occur. Sound intensity (sound energy, or propensity to cause damage to the ears) increases dramatically with proximity according to an inverse square law: halving the distance to the sound quadruples the sound intensity. In the usa,.5 of children aged 619 years have permanent hearing damage from excessive noise exposure. 34 The world health Organization estimates that half of those between 12 and 35 are at risk from using personal audio devices that are too loud. 7 hearing loss due to noise has been described as primarily a condition of modern society. 35 In preindustrial times, humans had far less exposure to loud sounds. Studies of primitive peoples indicate that much of what has been attributed to age-related hearing loss may be long term cumulative damage from all sources, especially noise.

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Exposures to other ototoxins (such as pesticides, some medications including chemotherapy agents, solvents, etc.) can lead to greater susceptibility to noise damage, as well as causing its own presentation damage. This is called a synergistic interaction. Since noise damage is cumulative over long periods of time, persons who are exposed to non-workplace noise, like recreational activities or environmental noise, may have compounding damage from all sources. Some national and international organizations and agencies use an exchange rate of 4 dB or 5 dB. 33 While these exchange rates may indicate a wider zone of comfort or safety, they can significantly underestimate the damage caused by loud noise. For example, at 100 dB (nightclub music level a 3 dB exchange rate would limit exposure to 15 minutes; the 5 dB exchange rate allows an hour. Many people are unaware of the presence of environmental sound at damaging levels, or of the level at which sound becomes harmful. Common sources of damaging noise levels include car stereos, children's toys, motor vehicles, crowds, lawn and maintenance equipment, power tools, gun use, musical instruments, and even hair dryers. Noise damage is cumulative; all sources of damage must be barbing considered to assess risk.

Environmental Protection Agency has identified the level of 70 dB(A) (40 louder to twice as loud as normal conversation; typical level of tv, radio, stereo; city street noise) for 24hour exposure as the level necessary to protect the public from hearing loss and other disruptive effects. 30 noise levels are typically in the 65 to 75 dB (A) range for those living near airports of freeways and may result in hearing damage if sufficient time is spent outdoors. 31 louder sounds cause damage in a shorter period of time. Estimation of a "safe" duration of exposure is possible using an exchange rate of 3 dB. As 3 dB represents a doubling of intensity of sound, duration of exposure must be cut in half to maintain the same energy dose. For workplace noise regulation, the "safe" daily exposure amount at 85 db a, known as an exposure action value, is 8 hours, while the "safe" exposure at 91 dB(A) is only 2 hours. 32 Different standards use exposure action values between 80dba and 90dBA. Note that for some people, sound may be damaging at even lower levels than 85 dB.

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argumentative essay about bridging the gap

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25 hearing loss due to noise may be temporary, called a 'temporary threshold shift a reduced sensitivity to sound over a wide frequency range resulting from exposure to a brief but very loud noise like a gunshot, firecracker, jet engine, jackhammer, etc. Or to exposure to loud sound over a few hours such as during a pop concert or nightclub session. 26 Recovery of hearing is usually within 24 hours, but may take up to a week. 27 Both constant exposure to loud sounds (85 dB(A) or above) and one-time exposure to extremely loud sounds (120 dB(A) or above) may cause permanent hearing loss. 28 noise-induced hearing loss (nihl) typically manifests as elevated hearing thresholds (i.e.

Less sensitivity or muting) between 30z, centered at 4000 Hz. As noise damage progresses, damage spreads to affect lower and higher frequencies. On an audiogram, the resulting configuration has a distinctive notch, called a 'noise' notch. As aging and other effects contribute to higher frequency loss (68 khz on an audiogram this notch may be obscured and entirely disappear. Various plan governmental, industry and standards organizations set noise standards.

There are many qualities of human hearing besides frequency range and amplitude that can't easily be measured quantitatively. But for many practical purposes, normative hearing is defined by a frequency versus amplitude graph, or audiogram, charting sensitivity thresholds of hearing at defined frequencies. Because of the cumulative impact of age and exposure to noise and other acoustic insults, 'typical' hearing may not be normative. 19 20 Signs and symptoms edit difficulty using the telephone loss of directionality of sound difficulty understanding speech, especially of children and women whose voices are of a higher frequency. Difficulty discriminating speech against background noise ( cocktail party effect ) sounds or speech becoming dull, muffled or attenuated need for increased volume on television, radio, music and other audio sources hearing loss is sensory, but may have accompanying symptoms: pain or pressure in the. For some kinds of hearing loss the cause may be classified as of unknown cause.

Age edit There is a progressive loss of ability to hear high frequencies with aging known as presbycusis. For men, this can start as early as 25 and women. Although genetically variable it is a normal concomitant of ageing and is distinct from hearing losses caused by noise exposure, toxins or disease agents. 21 Common conditions that can increase the risk of hearing loss in elderly people are high blood pressure, diabetes or the use of certain medications harmful to the ear. 22 While everyone loses hearing with age, the amount and type of hearing loss is variable. 23 noise edit main article: noise-induced hearing loss noise exposure is the cause of approximately half of all cases of hearing loss, causing some degree of problems in 5 of the population globally. 24 The national Institute for Occupational Safety and health (niosh) recognizes that the majority of hearing loss is not due to age, but due to noise exposure. By correcting for age in assessing hearing, one tends to overestimate the hearing loss due to noise for some and underestimate it for others.

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Speech perception Another aspect of daddy hearing involves the perceived clarity of a word rather than the amplitude of sound made by the word. In humans, that aspect is usually measured by tests of speech perception. These tests measure one's ability to understand speech, not to merely detect sound. There are very rare types of hearing loss which affect speech perception alone. Clarification needed 17 Use of the terms "hearing impaired "deaf-mute or "deaf and dumb" to describe deaf and hard of hearing people is discouraged by advocacy organizations as they are offensive to many deaf and hard of hearing people. 18 hearing standards edit see also: Absolute threshold of hearing and hearing range further information: Equal-loudness contour and A-weighting Human hearing extends in frequency from 2020,000 hz, and in amplitude from 0 dB to 130 dB or more. 0 dB does not represent absence of sound, but rather the softest sound an average unimpaired human ear can hear; some people can hear down to 5 or even 10 dB. 130 dB represents the threshold of pain. But the ear doesn't hear all pdf frequencies equally well; hearing sensitivity peaks around 3000 Hz.

argumentative essay about bridging the gap

16 The term hearing impairment is often viewed negatively as it emphasises what people cannot. 12 Contents Definition edit hearing loss exists when there is diminished sensitivity to the sounds normally heard. 11 The terms hearing impaired or hard of hearing are usually reserved for people who have relative insensitivity to sound in the speech frequencies. The severity of a hearing loss is categorized according to the increase in volume above the usual level necessary before the listener can detect. Deafness is defined as a degree of loss such that a person is unable to understand speech even in the presence of amplification. 11 In profound deafness, even the loudest sounds produced by an audiometer (an instrument used to measure hearing by producing pure tone sounds through a range of frequencies) may not be detected. In total deafness, no sounds at resume all, regardless of amplification or method of production, are heard.

in many areas of the world. Earing loss affects about.1 billion people to some degree. 8 It causes disability in 5 (360 to 538 million) and moderate to severe disability in 124 million people. 2 9 10 Of those with moderate to severe disability 108 million live in low and middle income countries. 9 Of those with hearing loss it began in 65 million during childhood. 11 Those who use sign language and are members of deaf culture see themselves as having a difference rather than an illness. 12 Most members of deaf culture oppose attempts to cure deafness and some within this community view cochlear implants with concern as they have the potential to eliminate their culture.

Certain infections during pregnancy such as syphilis and rubella may also cause hearing loss in the child. 2, hearing loss is diagnosed when hearing testing finds that a person is unable to hear 25 decibels in at least one ear. 2, testing for poor hearing is recommended for all newborns. 6 hearing loss can be categorised as mild, moderate, moderate-severe, severe, or profound. 2 There are three main types of hearing loss, conductive hearing loss, sensorineural hearing loss, and mixed hearing loss. 3 About half of hearing loss globally is preventable through public health measures. 2 Such practices include immunization, proper care around pregnancy, avoiding london loud noise, and avoiding certain medications. 2 The world health Organization recommends that young people limit the use of personal audio players to an hour a day in an effort to limit exposure to noise.

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For other uses, see. Hearing loss, also known as hearing assignment impairment, is a partial or total inability to hear. 5, a deaf person has little to no hearing. 2, hearing loss may occur in one or both ears. 2, in children hearing problems can affect the ability to learn spoken language and in adults it can cause work related difficulties. 6, in some people, particularly older people, hearing loss can result in loneliness. 2, hearing loss can be temporary or permanent. Hearing loss may be caused by a number of factors, including: genetics, ageing, exposure to noise, some infections, birth complications, trauma to the ear, and certain medications or toxins. 2, a common condition that results in hearing loss is chronic ear infections.

Argumentative essay about bridging the gap
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