Biomedical subjects

J C Lafon

Publications and source records attributed to J C Lafon.

15 recordsLinked to original sources

PubMed1990

[Hearing in the elderly and hearing aids].

Statistically progressive deteriorations in the population, due more to pathological impairments than to aging properly speaking, must be distinguished from presbycusis. The onset of auditive impairment varies with genetic factors. In a statistical audiometric study, it is found that the better the hearing of a subject before the impact of presbycusis, the better the chances are of maintaining hearing; the opposite applies in the case of major auditive deterioration. Loss of hearing due to presbycusis affects all frequencies. The elderly patient has a better social value of hearing in the phonetic test than that expected from tonal audiometry, except in the case of disorders of central auditive integration.

Aged↗

PubMed1990

[Analysis of word perception in deaf children. A longitudinal study].

The assessment of speech perception and speech reading has been studied with the phonetic test of J.C. Lafon (lists of 17 french words with 3 phonemes each). 168 children from 7 to 17 have been collected. Deafness was moderate, severe or profound. It was always congenitaly sensoneural hearing loss. In order to precise data, results are giving regard to educational program: mainstream or special classes. Comparative data for each degree of deafness are given for speech perception, lipreading and both auditory and visual sensorial ways.

Adolescent↗

PubMed1989

[Hearing aids with distorsion].

The authors recall how reinforcements of fundamentals and first harmonics produced by differential sounds in old amplifier tube hearing aids were discovered. The authors report the evolution and principles of devices using compensation and coded signals, in order to select low frequency information of the "with distorsion hearing aids". The continuous support of Paul Hennebert in this scope is emphasized.

Acoustics↗

PubMed1988

Early detection of hearing loss in children with cleft palates by brain-stem auditory response.

The hearing of 23 children with cleft palates was studied at an early age (before 12 months) and before pharyngoplasty using the electrophysiologic method of auditory brain-stem response. Nineteen children showed important degrees of conduction deafness of 50 or 60 dB. Results were compared with those obtained for a group of normal children tested under the same method before age 6 months. No hearing loss was observed in this group. It is concluded that hearing defects appear at an early age in children with cleft palates and are in direct relationship to the malformation. Hypotheses concerning the etiopathogeny of these hearing losses are proposed.

Brain Stem↗

PubMed1987