Numbness, deafness: What is it?
deafness is a hearing loss can be unilateral or bilateral. Is only an ear deaf, the ability is impaired, determine the direction and distance of a sound source. are both ears deaf, is a deafness before: Then noises and sounds are no longer perceptible.
When deafness refers to medical definition only to the hearing. Here physicians distinguish between absolute and practical deafness:
In addition, defines the The Deaf community deafness also linguistic and cultural identity: Accordingly, the deaf are hearing impaired, which preferably communicate in sign language and see themselves as part of this linguistic community and their culture. Also, who is not affected by deafness, but mastered sign language, can be seen as a member of this ethnic group and culture.
A bilateral deafness may already exist at birth (congenital (Numbness or deafness) or develop only in the course of lifeacquired Deafness). Depending on the time at which the hearing is lost, the following types can be distinguished:
This subdivision is important in terms of consequences, the bilateral deafness for normal language acquisition can have a child:
A Early unilateral deafness however, the child affected Not in his language development.
In the Federal Republic of Germany about 80,000 people from bilateral deafness or deafness are affected, which corresponds to a frequency of about 0.1 percent. Every year about 600 to 800 children in Germany deaf to the world.
Since the 17th century the relationship between hearing and speaking are known - and thus the potential consequences of deafness or deafness. This realization was the prerequisite for Schools for the deaf to accomplish. The establishment of the first school for the deaf was held in Germany as a deaf-mute Institute in 1788 in Berlin.