LAFON 51A THE PRIMARY HEARING (road to language) part 11

Deafs persons, with add-on integrative disorder or not, are, by definition, suffering from deafness which can be highlighted and assessed by pure tone audiometry.

They can all benefit from performing speech audiometry. As we’ve already told it, it’s the only means of testing hearing in its entirety.

Phonetic distortions discovered through this way generally increase along with the decreased level of speech emission.

Hearing aids, through the selective amplification provided by the Audioprothesist, will enable people to regain a far better audibility of the received message, hence a better understanding. Among Professor J.C. LAFON’s list has to be used. It allows to discover phonetic mistakes generated by the only cochlea, with no mental substitution, and by « echolalia » answering.(1)

Each cochlear list’s element consists of 17 words made of 3 phonemes, which can be emitted in open field, at a level of 90 SPL dB (for example), as a beginning. Then, other elements are emitted at less important levels. For example : 80, 70, 60, 50, 40 SPL dB. That is my own practise. Ear by ear.

The same elements, for the same ear at the same levels, can be repeated by the persons needing to wear hearing aids, first with no hearing aid, and then with hearing aids that you will have selected and set. Thus, we obtain a vocal prosthetic benefit much more efficient and convincing than the pure tone prosthetic benefit. To fix things, lets’ say that from 50-55 HL dB of loss in pure tone audiometry, the vocal prosthetic benefit has to be preferred.

From my experience, this type of practice is workable with adults, but also with deaf children of around 10 years old (with not profound deafness), and with no associated handicap. For further information on the cochlear list, refer to the publications « LAFON 6 THE COHLEAR LIST (1) » and « LAFON 7 THE COCHLEAR LIST (2) », already published.




(1) Professor J.C. LAFON « compensated amplification » Bulletin of Audiophonology 1971 N°2 Volume 1 page 160


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