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Wednesday, May 4, 2011

Deafness and Hearing Loss

Deafness is a condition wherein the ability to detect certain frequencies of sound is completely or partially impaired. When applied to humans, the term hearing impaired is rejected by the Deaf Culture movement, where the terms deaf and hard-of-hearing are preferred.
Hearing sensitivity is indicated by the quietest sound that an animal can detect, called the hearing threshold. In the case of humans and some animals, according to the Hearing Aids this threshold can be accurately measured by a behavioral audio gram.

Normal hearing thresholds within any given species are not the same for all frequencies. If different frequencies of sound are played at the same amplitude, some will be perceived as loud, and others quiet or even completely inaudible. Generally, if the gain or amplitude is increased, a sound is more likely to be perceived. Ordinarily, when animals use sound to communicate, hearing in that type of animal is most sensitive for the frequencies produced by calls, or in the case of humans, speech. All levels of the auditory system contribute to this sensitivity toward certain frequencies, from the outer ear's physical characteristics to the nerves and tracts that convey the nerve impulses of the auditory portion of the brain.
A hearing loss exists when an animal has diminished sensitivity to the sounds normally heard by its species. In humans, the term hearing impairment is usually reserved for people who have relative insensitivity to sound in the speech frequencies.

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Refurbished Wheelchairs

There are better ways to help a person than simply grabbing the handles of their wheelchair and start walking.With a wheelchair accessible vehicle, the disabled can travel independently.The inability to gain access to the areas or activities they enjoy most can be hard to deal with.  Today's technology on the mobility market can make it possible to enjoy a new sense of freedom.There are many wheelchairs options available, some of which will allow you to get a no cost or a low cost Wheelchairs.

A wide range of refurbished wheelchair models for their customers.wheelchairs can be folded and Space conscious.Wheelchairs Lightweight Folding Aluminium Transit refurbished wheelchair models for their attendee dependant handicapped customers. Wheelchairs are available in three-wheeled and four-wheeled mobility scooters for their customers.

When purchasing wheelchairs there are a few things to consider. First is how often you will need to use the wheelchair. Second, what type of styles do you prefer?Most people prefer the lightweight, manual chairs.There is also the option of whether you should buy a new wheelchair or an old one. Before you spend thousands of dollars on a power wheel chair you really should check out the internet.

Refurbishes donated wheelchairs and individually fits them to children and adults with disabilities in developing nations.The company recycles and refurbishes pre-owned electric wheelchairs and scooters for resale at a fraction of the cost or at no cost to those whom the government and insurance have let down.The local initiative helps buy and repair wheelchairs for those in financial need.

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