Audiology
Resources
Glossary of Terms
A
Acoustic Neuroma – A tumor, usually benign,
which develops on the hearing and balance nerves and can cause
gradual hearing loss, tinnitus, and dizziness.
Acquired Deafness – Loss of hearing that
occurs or develops sometime in the course of a lifetime, but
is not present at birth.
American Sign Language (ASL) – Manual (sign) language with its own syntax and grammar used primarily by people who are deaf.
Assistive Devices – Tools and devices such as alarms, alerting devices, or FM systems used to help people hear to perform daily actions, tasks, and activities. Learn more about assistive listening devices.
Audiologist – 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 Nerve – Eighth cranial nerve that
connects the inner ear to the brain.
Auditory Perception – 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. Learn more about APD.
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.
B
Balance – 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.
Balance Disorder – 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.
Barotrauma – Injury to the middle ear
caused by a rapid change of air or water pressure.
Brainstem Implant – 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.
C
Captioning – 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 dry
and protected from infection.
Cholesteatoma – An abnormal accumulation and pocketing of dead cells
in the eardrum, which can often be surgically repaired.
Cochlea – Snail-shaped structure in the
inner ear that contains the organ of hearing.
Cochlear Implant – 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. Learn
more about cochlear implants.
Cognition – 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.
D
Decibel (dB) – The unit used to measure the intensity or loudness of sound.
Dizziness – Physical unsteadiness, imbalance,
and lightheadedness associated with balance disorders. Learn
more about balance disorders and dizziness.
Dysequilibrium – Any disturbance of balance.
E
Ear Infection – 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.
H
Hair Cells – 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.
Hearing – 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.
Hearing Aid – A battery-powered electronic device that brings amplified
sound to the ear. A hearing aid usually consists of a microphone,
amplifier, and receiver. Learn
more about hearing aids.
Hearing Loss – 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. Learn
more about hearing loss.
Hereditary Hearing Impairment – Inherited hearing
loss that is passed down through the family.
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I
Inner Ear – Part of the ear that contains
both the organ of hearing (the cochlea) and the organ of balance
(the labyrinth).
L
Labyrinth – Organ of balance located in the inner
ear. The labyrinth consists of three semicircular canals and
the vestibule.
Labyrinthitis – Viral or bacterial infection
or inflammation of the inner ear that can cause dizziness, loss
of balance, and temporary hearing loss.
M
Mastoid – Hard, boney structure behind the ear.
Mastoid Surgery – Surgical procedure to
remove infection from the mastoid bone.
Ménière's Disease – 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, roaring
tinnitus, and the sensation of fullness in the ear.
Meningitis – Inflammation of the meninges,
the membranes that envelop the brain and the spinal cord; may
cause hearing loss
or deafness.
Middle Ear – 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.
Motion Sickness – Dizziness, sweating,
nausea, vomiting, and generalized discomfort experienced when
an individual is in motion.
N
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. Learn more about noise-induced hearing loss.
O
Otitis Media – Inflammation of the middle
ear caused by infection.
Otoacoustic Emissions – 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.
Otolaryngologist – Physician/surgeon who
specializes in diseases of the ears, nose, throat, and head and
neck.
Otologist – Physician/surgeon who specializes
in diseases of the ear.
Otosclerosis – 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.
Ototoxic Drugs – Drugs that can damage
the hearing and balance organs located in the inner ear.
Outer Ear – External portion of the ear,
consisting of the pinna, or auricle, and the ear canal.
P
Postlingually Deafened – Individual who
becomes deaf after having acquired language.
Prelingually Deafened – Persons either
born deaf or who lost his or her hearing early in childhood,
before acquiring language.
Presbycusis – 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. Learn more about
aging and hearing loss.
S
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. Learn
more about sensorineural hearing loss.
Sign Language – Method of communication
for people who are deaf in which hand movements,
gestures, and facial expressions convey grammatical structure
and meaning.
Sudden Hearing Loss – Loss of hearing that
occurs quickly due to such causes as an explosion or a viral infection.
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T
Tinnitus – 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. Learn
more about tinnitus.
Tympanoplasty – Surgical repair of the
eardrum (tympanic membrane) or bones of the middle ear.
V
Vertigo – 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).
Vestibular System – 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.
Vestibule – Boney cavity of the inner ear.