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The Hearing Dictionary Online - G, H, IA | B | C | D | E | F | G | H | I | J | K | L Genetic Deafness - deafness transmitted by faulty genes. The trismoy syndromes exemplify the abnormal genetric transmissions that result in hearing impairments. German Measles - rubella; contagious viral disease characterized by swollen glands and small red spots on the skin. If contracted by the mother during the first trimester of pregnancy, can cause complications as well as hearing loss; however, rubella vaccination programs have significantly decreased its occurrence. Hair Cells - tiny hair-like structures in the inner ear that help transmit sound to the brain.
Hearing - one of the five senses - the one that responds to sound pressure waves. Hearing Aid - an electronic amplifying device to make sounds audible to the individual with a hearing loss. Sound pressure waves are converted into electricity by a microphone. The electric impulses are then amplified through controlled electronic circuitry. The amplified electric impulses are then reconverted by a receiver to be presented to the impaired ear. syn: hearing instrument. Hearing Aid Specialist - A licensed hearing care professional, who specializes in the fitting of hearing aids. Hearing Evaluation - a battery of tests of the auditory system and its functions Hearing Loss, Conductive - impairment of hearing due to the failure of sound pressure waves to reach the cochlea through the normal air conduction channels. This type of deafness is often responsive to medical or surgical treatment. Hearing Loss, Sensorineural - hearing loss (also known as nerve deafness), one in which bones, eardrum, and membranes are intact, but a deterioration of the inner ear is present. This may be caused by the natural aging process, or degeneration of the nerves leading from the inner ear to the brain. Hearing Screening - an abbreviated version of the hearing evaluation to determine if further testing is required Hearing Threshold - the softest sound audible; a stimulus that is detected 50% of the time when presented Hearing, Traveling Wave Theory of - movement of the footplate of the stapes, causes a fluid wave to move along the basilar membrane with a rise and fall of amplitude. The point where the wave reaches its maximum amplitude is the point where the frequency of the sound is detected. Frequencies are highest toward the oval window and lowest toward the apex of the cochlea. Georg von Bekesy received the Nobel prize in 1961 for his discovery of the traveling wave phenomenon that resulted in this theory Helix - The in-curve rim of the external ear. Hereditary - traits which are inherited from parents Herpes Simplex Virus - a communicable virus believed to be responsible for congenital deafness and other anomalies when present in the genital tract during birth Hertz, HZ (hertz) - the term used for cycles per second - named in honor of the German physicist Heinrich Hertz, 1857-1894 High Fidelity - the reproduction or amplification of sound waves with a minimum of distortion High Frequency - an inexact term which, in audiology, generally refers to any frequency above 1000 Hz Hyperbilirubinemia - an abnormally high level of liver secretion in the blood Hysterical Deafness - nonorganic or functional hearing loss sometimes unconsciously developed as a psychic protection under conditions of severe emotional strain. syn: conversion deafness Impression - a cast made of the contours within the external ear from which an earmold (for BTE instruments) or custom shell (for ITE, ITC and CIC instruments) is made. Impressions typically are made using a silicone or audalin material which is plastic for insertion and cures within a few minutes for removal. Inclusion - an educational concept for a child with delays or difficulties in one or more areas, such as hearing loss, speech delay, motor, or cognitive disorders. Inclusion refers to the idea that all children belong in a setting which is part of their regular, daily routine, e.g. school, home, day care Incus - one of the bones of the middle ear; also called the anvil due to the shape of the bone Infrared System - an assistive listening device consisting of a microphone/transmitter placed near the sound source of interest that transmits the signal through infrared light waves to a receiver/amplifier, thereby enhancing the signal-to-noise ratio Induction Coil - a conductor wound into a spiral into which current flow is induced when a magnetic field enters its vicinity; in a hearing aid the telecoil is an induction coil and the telephone produces the magnetic field Induction Loop System - continuous wire surrounding a room (such as a classroom or large hall) that conducts electrical energy from an amplifier and creates a magnetic field; current flow from the loop is induced in the hearing aid telecoil Inner Ear - contains the cochlea and the semi-circular canals; often the site of damage in sensori-neural hearing loss Intensity Of Sound - The intensity of a sound wave refers to the strength of the particle vibration, or the rate of sound energy transmission through a medium.The greater the intensity of sound, the louder the sound will be. In-the-canal Hearing Aid (ITC) - custom hearing aid that fits mostly in the ear canal with a small portion extending into the outer ear or concha In-the-ear Hearing Aid (ITE) - custom hearing aid that fits almost entirely in the outer or concha portion of the ear ITC - see In-the-canal Hearing Aid ITE - see In-the-ear Hearing Aid A | B | C | D | E | F | G | H | I | J | K | L HearingCentreOnline.com would like to thank and acknowledge Starkey Labs and Siemens Hearing for their generous contributions of some of the definitions in this online dictionary of hearing terms. |
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