Definitions for audiogramˈɔ di əˌgræm
This page provides all possible meanings and translations of the word audiogram
Random House Webster's College Dictionary
au•di•o•gramˈɔ di əˌgræm(n.)
the graphic record produced by an audiometer.
Origin of audiogram:
a graphical representation of a person's auditory sensitivity to sound
A graphical representation of the hearing ability of a person
An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer. The Y axis represents intensity measured in decibels and the X axis represents frequency measured in Hertz. Most audiograms cover a limited range of frequencies 100 Hz to 8000 Hz because this range includes the fundamental frequency of sounds in speech. The threshold of hearing is plotted relative to a standardised curve that represents 'normal' hearing, in dB. They are not the same as equal-loudness contours, which are a set of curves representing equal loudness at different levels, as well as at the threshold of hearing, in absolute terms measured in dB SPL. Audiograms are set out with frequency in hertz on the horizontal axis, most commonly on a logarithmic scale, and a linear dBHL scale on the vertical axis. Normal hearing is classified as being between −10 dB and 15 dB, although 0 dB from 250 Hz to 8 kHz is deemed to be 'average' normal hearing. Hearing thresholds of humans and other mammals can be found by using behavioural hearing tests or physiological tests. An audiogram can be obtained using a behavioural hearing test called Audiometry. For humans the test involves different tones being presented at a specific frequency and intensity. When the person hears the sound they raise their hand or press a button so that the tester knows that they have heard it. The lowest intensity sound they can hear is recorded. The test varies for children, their response to the sound can be a head turn or using a toy. The child learns what they can do when they hear the sound, for example they are taught that when they heard the sound they can put a toy man in a boat. A similar technique can be used when testing some animals but instead of a toy, food can be used as a reward for responding to the sound. Physiological tests do not need the patient to respond. For example when performing the brainstem auditory evoked potentials the patient’s brainstem responses are being measured when a sound is played into their ear. In the US, the NIOSH recommends that people who are regularly exposed to hazardous noise have their hearing tested once a year, or every three years otherwise.
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