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Medical history, your current and past these abnormalities include hypothyroidism, hyperthyroidism, hyperlipidemia because of the multifactorial nature.

19.10.2014

Hearing age frequency, dsm depressive disorder nos code - PDF Review

Author: admin
As you can see from the graph, severity of age-related hearing loss depends on sound frequency: older people need high-pitched sounds to be displayed more loudly, in order to hear them. It's not described much on the website, but the book explains that there is a relationship between how loud a sound has to be to harm you, and which frequency it is. Here's a plot of the connection between loudness and frequency in auditory perception, in which you can see that sounds around 4kHz can most easily harm us. According to this chart, music should start sounding significantly worse and worse for anyone over the age of 35. Compared to the average person in this chart, I've aged my hearing by 2 years beyond expected. Oddly enough as I've continued to age and lose more and more hearing, via listening experience I've actually gained greater perception of speaker distortions than when I was younger with better hearing.


If it is a bell-curve average, then 25% will have no significant loss in hearing, and 25% will have far-worse than normal.
Characteristically, presbycusis involves bilateral high-frequency hearing loss associated with difficulty in speech discrimination and central auditory processing of information. Sounds that are near our auditory thresholds (under 20 Hz and above 20.000 Hz in the normal, healthy hearing range) can't harm us even if they are extremely loud. These changes correlate with a precipitous drop in the high-frequency thresholds, which begins after middle age. This correlates with a gradually sloping high-frequency sensorineural hearing loss that is slowly progressive.
We don't hear them because they cause no mechanical change in our ear that responds to those frequencies, and consequently no harm is done.


The abrupt downward slope of the audiogram begins above the speech frequencies; therefore, speech discrimination is often preserved. In the case of age-related hearing loss, the hair cells in the inner ear that should respond to high-frequency sounds, have already stopped responding, so there is nothing left to harm.



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