Biomedical subjects

G A McCandless

Publications and source records attributed to G A McCandless.

3 recordsLinked to original sources

PubMed1979

Auditory dysfunction with facial paralysis.

A series of 58 patients with idiopathic facial paralysis were studied to determine if a concomitant cochlear or eight nerve auditory dysfunction could be identified with traditional audiologic tests. Results indicated that only those patients with a facial nerve lesion, proximal to the stapedius branch, experienced reduced tolerance for loud sounds, reduction of speech discrimination at high-intensity levels, and abnormal loudness growth. Such findings suggest that changes in auditory function, accompanying facial nerve paralysis, are a mechanical effect due to absence of stapedial action. Site of lesion tests in this sample failed to demonstrate eighth nerve dysfunction and, thus, does not support a theory of polyneuropathy that involves the auditory nerve.

Adolescent↗

PubMedDate not supplied

Hearing aid performance relative to site of lesion.

This study investigated hearing aid acceptance and use as functions of the probable site of a lesion: conductive, cochlear, neural, and central as determined by an audiometric test battery. Results indicate significantly better acceptance of aids in conductive and cochlear disorders than in more central neural and central disorders.

Adolescent↗

PubMedDate not supplied

Influence of amplification on the discrimination of dichotic consonant-vowel syllables in a population with sensorineural hearing loss.

This study was designed to investigate the premise that the long-term use of monaural amplification influences dichotic listening conditions in a population with sensorineural hearing losses. 30 subjects with moderate, bilateral sensorineural hearing losses and 10 normally-hearing adults were chosen for this study. 20 of the subjects with sensorineural hearing loss had worn amplification successfully for at least 1 year prior to testing. 10 of these subjects had worn amplification only on the right ear while the remaining 10 had worn amplification only on the left ear. All subjects received 60 monaural and dichotic consonant-vowel (CV) nonsense syllables presented at equal loudness levels using the most comfortable level (MCL) as the loudness criteria. While monaural scores revealed nonsignificant differences between ears for all subjects, using percentage of error, dichotic results produced a right-ear advantage for the right-ear-aided, unaided and normally-hearing subjects. A significant left-ear advantage was seen for the left-ear-aided subjects. Results of this study suggest that amplification introduces selective listening effects which alter reported dichotic test scores.

Audiometry, Pure-Tone↗