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Assistive devices can be used alone or paired with a hearing aid or cochlear implant to aid listening in difficult or noisy environments. In the United States of America, the type preferred by most deaf adults is American Sign Language (ASL), which has rules and grammar that is distinct from English. There are also several variations of sign ...
Genetic testing: Genetic testing may be recommended, especially if there is a family history of hearing loss. Nonsyndromic deafness can be caused by mutations in various genes associated with auditory function. Besides, high-throughput DNA sequencing methods can be employed to screen multiple genes simultaneously. [7]
This accounts for around 30% of deaf individuals who are deaf from a genetic standpoint. [25] 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 ...
In human development, muteness or mutism [1] is defined as an absence of speech, with or without an ability to hear the speech of others. [2] Mutism is typically understood as a person's inability to speak, and commonly observed by their family members, caregivers, teachers, doctors or speech and language pathologists.
It is estimated that Waardenburg syndrome is present in 2–5% of congenitally deaf people. Congenital deafness comprises around half of deafness as a whole. [8] About 1 in 30 students in schools for the deaf have Waardenburg syndrome. The variable presentation of the syndrome makes it difficult to arrive at precise figures for its prevalence. [8]
For some, this condition might happen congenitally from birth as a result of genetic defect, for others it happens suddenly due to a form of illness or accident that results in a modality deprivation of either vision or hearing, or both. [8] A person might be born deaf and become blind at a later stage in life, or vice versa.
Prelingual hearing loss can be considered congenital, present at birth, or acquired, occurring after birth before the age of one. Congenital hearing loss can be a result of maternal factors (rubella, cytomegalovirus, or herpes simplex virus, syphilis, diabetes), infections, toxicity (pharmaceutical drugs, alcohol, other drugs), asphyxia, trauma, low birth weight, prematurity, jaundice, and ...
Deafness is defined as a degree of loss such that a person is unable to understand speech, even in the presence of amplification. [15] In profound deafness, even the highest intensity 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 ...