Articulation Index
Articulation Index
Articulation Index (pronunciation: ahr-tik-yuh-ley-shuhn in-deks, from Latin articulatio meaning "division into joints" and index meaning "indicator") is a numerical method used in Audiology to measure the proportion of speech that is audible to a person with hearing loss. It is a significant concept in the field of Audiometry and Hearing Aid design.
Definition
The Articulation Index (AI) is a calculation used to predict the amount of speech that is audible to a person with a specific hearing loss. It is a number between 0 and 1, where 1 indicates that all speech sounds are audible and 0 indicates that no speech sounds are audible.
Calculation
The AI is calculated by dividing the total number of speech sounds that are audible to the person by the total number of speech sounds in the speech material. This calculation takes into account the person's hearing loss at different frequencies, the importance of different frequencies for understanding speech, and the level of background noise.
Use in Audiology
In Audiology, the AI is used to assess the impact of a person's hearing loss on their ability to understand speech. It is also used to guide the fitting of hearing aids and cochlear implants, with the aim of maximizing the AI.
Related Terms
External links
- Medical encyclopedia article on Articulation Index
- Wikipedia's article - Articulation Index
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