Glossary Of Terms
Acoustic Neuroma/Vestibular Schwannoma
A tumor, usually benign, which develops on the hearing and balance nerves and can cause gradual hearing loss, tinnitus, and dizziness.
Loss of hearing that occurs or develops sometime in the course of a lifetime, but is not present at birth.
Tools and devices such as alarms, alerting devices, FM systems, and wireless devices used to help people hear to perform daily actions, tasks and activities.
A health care professional trained to evaluate hearing loss and related disorders, including balance (vestibular) disorders and tinnitus, and to rehabilitate people with hearing loss and related disorders. Audiologists use a variety of tests and procedures to assess hearing and balance function and to fit and dispense hearing aids and other assistive devices for hearing loss. Most audiologists have advanced doctorate degrees.
Auditory Brainstem Response (ABR) Test
Used to test the hearing of infants and young children, or to test the functioning of the hearing nerve. This painless procedure involves attaching recording disks to the head to record electrical activity from the hearing nerve and brain stem.
Auditory / Vestibular Nerve
Eighth cranial nerve that connects the inner ear to the brain.
Ability to identify, interpret, and attach meaning to sound.
Auditory Processing Disorder (APD)
Inability of an individual with normal hearing and intelligence to differentiate, recognize, or understand sounds normally.
Autoimmune Hearing Loss
Hearing loss when one’s immune system produces abnormal antibodies that react against the body’s healthy tissues. May be associated with tissue-causing disease, such as rheumatoid arthritis or lupus.
A biological system that enables individuals to know where their bodies are in the environment and to maintain a desired position. Normal balance depends on information from the labyrinth in the inner ear, from other senses such as sight and touch, and from muscle movement.
Disruption in the labyrinth, the inner ear organ that controls the balance system, which allows individuals to know where their bodies are in the environment. The labyrinth works with other systems in the body, such as the visual and skeletal systems, to maintain posture.
Injury to the middle ear caused by a rapid change of air or water pressure.
Auditory prosthesis that bypasses the cochlea and auditory nerve. This type of implant helps people who can’t benefit from a cochlear implant because the auditory nerves are not working.
Text display of spoken words, presented on a television or a movie screen, that allows deaf or hard-of-hearing viewers to follow the dialogue and the action of a program simultaneously.
Cerumen (Ear Wax)
Yellow secretion from glands in the outer ear canal that keeps the skin of the ear canal moist and protected from infection.
An abnormal accumulation and pocketing of dead cells in the eardrum, which can often be surgically repaired.
Snail-shaped structure in the inner ear that contains the organ of hearing.
Medical device that bypasses damaged structures in the inner ear and indirectly stimulates the auditory nerve, allowing some deaf and hard of hearing individuals to learn to hear and interpret sounds and speech.
Thinking skills that include perception, memory, awareness, reasoning, judgment, intellect, and imagination.
Conductive Hearing Loss
Hearing loss caused by an abnormal transmission of sound in the outer or middle ear. Most common in children.
The unit used to measure the intensity or loudness of sound.
Physical unsteadiness, imbalance, and lightheadedness associated with balance disorders.
Any disturbance of balance.
Presence and growth of bacteria or viruses usually in the middle ear.
Ear Wax (Cerumen)
Yellow secretion from glands in the outer ear canal that keeps the skin of the ear canal dry and protected from infection.
Sensory cells of the inner ear, which are topped with hair-like structures (stereocilia), which transform the mechanical energy of sound waves into nerve impulses.
A sense, series of events in which sound waves in the air are converted to electrical signals, which are sent as nerve impulses to the brain, where they are interpreted as sound.
A battery-powered electronic device that brings amplified sound to the ear. A hearing aid usually consists of a microphone, amplifier, and receiver.
Disruption in the normal process that may occur in either the outer, middle, or inner ear, whereby sound waves are not conducted to the inner ear, converted to electrical signals and/or nerve impulses are not transmitted to the brain to be interpreted as sound.
Hereditary Hearing Impairment
Inherited hearing loss that is passed down through the family.
Part of the ear that contains both the organ of hearing (the cochlea) and the organ of balance (the labyrinth).
Organ of balance located in the inner ear. The labyrinth consists of three semicircular canals and the vestibule.
Viral or bacterial infection or inflammation of the inner ear that can cause dizziness, loss of balance, and temporary hearing loss.
Hard, boney structure behind the ear.
Surgical procedure to remove infection from the mastoid bone.
An inner ear disorder that can affect both hearing and balance and is usually associated with vertigo (feeling like you’re spinning when you’re really not), hearing loss, nausea, roaring tinnitus, and the sensation of fullness in the ear.
Inflammation of the meninges, the membranes that envelop the brain and the spinal cord; may cause hearing loss or deafness.
Part of the ear that includes the eardrum and three tiny bones (ossicles) of the middle ear, ending at the oval window that leads to the inner ear.
Dizziness, sweating, nausea, vomiting, and generalized discomfort experienced when an individual is in motion.
Noise-induced Hearing Loss
Hearing loss caused by exposure to very loud 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.
Inflammation of the middle ear caused by infection.
Low-intensity sounds produced by the inner ear that can be quickly measured with a sensitive microphone placed in the ear canal in individuals with normal hearing. Often used to screen the hearing of infants.
Physician/surgeon who specializes in diseases of the ears, nose, throat, and head and neck.
Physician/surgeon who specializes in diseases of the ear.
Abnormal growth of bone around the ossicles and the inner ear. This bone prevents structures within the ear from working properly and causes hearing loss. For some people with otosclerosis, the hearing loss may become severe, but often the hearing can be improved by surgery or hearing aids.
Drugs that can damage the hearing and balance organs located in the inner ear.
External portion of the ear, consisting of the pinna, or auricle, and the ear canal.
Individual who becomes deaf after having acquired language.
Persons either born deaf or who lost his or her hearing early in childhood, before acquiring language.
Loss of hearing that gradually occurs because of changes in the inner or middle ear in individuals as they grow older the type of hearing loss often associated with presbycusis is a sensorineural hearing loss.
Sensorineural Hearing Loss
Hearing loss caused by damage to the sensory cells and/or nerve fibers of the inner ear. The most common type of hearing loss in adulthood.
Sudden Hearing Loss
Loss of hearing that occurs quickly due to such causes as an explosion or a viral infection.
Sensation of a ringing, roaring, or buzzing sound in the ears or head. It is often associated with many forms of hearing loss and noise exposure.
Surgical repair of the eardrum (tympanic membrane) or bones of the middle ear.
Illusion of movement; a sensation as if the external world were revolving around an individual (objective vertigo) or as if the individual were revolving in space (subjective vertigo).
System in the body that is responsible for maintaining balance, posture, and the body’s orientation in space. This system also regulates locomotion and other movements and keeps objects in visual focus as the body moves.