Glossary Terms: N

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Natural Language
Language acquired primarily through the accessible sensory channel(s).

Neural Plasticity
Ability of the brain and/or certain parts of the nervous system to adapt to new conditions, such as an injury.

Neural Prostheses
Devices that substitute for an injured or diseased part of the nervous system, such as the cochlear implant.

Neural Stimulation
To activate or energize a nerve through an external source.

Neurofibromatosis Type 1 (NF-1 von Recklinghausen's)
Group of inherited disorders in which noncancerous tumors grow on several nerves that may include the hearing nerve. The symptoms of NF-1 include coffee-colored spots on the skin, enlargement, deformation of bones, and neurofibromas.

Neurofibromatosis Type 2 (NF-2)
Group of inherited disorders in which noncancerous tumors grow on several nerves that usually include the hearing nerve. The symptoms of NF-2 include tumors on the hearing nerve which can affect hearing and balance. NF-2 may occur in the teenage years with hearing loss. Also see acoustic neurinoma.

Neurogenic Communication Disorder
Inability to exchange information with others because of hearing, speech, and/or language problems caused by impairment of the nervous system (brain or nerves).

No Child Left Behind (NCLB)
The current revision of the Elementary and Secondary Education Act (ESEA) – the principle federal law affecting public education from kindergarten through high school in the United States.

Noise-Induced Hearing Loss
Hearing loss caused by exposure to harmful sounds, either very loud impulse sound(s) or repeated exposure to sounds over 90-decibel level over an extended period of time that damage the sensitive structures of the inner ear.

Nonsyndromic Hereditary Hearing Impairment
Hearing loss or deafness that is inherited and is not associated with other inherited clinical characteristics.

One who writes notes for the deaf or hard-of-hearing persons in various settings such as the classroom or in the office. For more detailed information, see Notetaker in the section on Support Aids.