Biomedical subjects

G L Whitehead

Publications and source records attributed to G L Whitehead.

4 recordsLinked to original sources

PubMed1977

Hearing under stress: II. Effect of hyperventilation and hypercapnia on speech discrimination.

Changes in the ability to discriminate speech from a eucapnic state to hyperventilation and hypercapnia were investigated. Standard speech audiometric techniques were employed to determine the speech reception threshold and the speech discrimination values, while respiratory conditions were varied and measured utilizing a mixed-gas breathing method. Respiratory parameters were similar to those encountered in aircraft personnel who experience oxygen/pressure system malfunction. The results of the study suggest no significant change in the speech reception threshold while in a hyperventilated or hypercapnic state. The speech discrimination results, however, suggest a significant performance decrement while in a state of hyperventilation.

Auditory Perception↗

PubMed1976

Hearing under stress: III. The effect of external auditory meatal pressure on speech discrimination.

It has been well established that unequal air pressure across the tympanic membrane causes an increase in puretone thresholds. Very little information is available, however, concerning concommitant effects on reception and discrimination of speech material. This study was designed to determine whether or not further detrimental effects upon the communication process might occur in the form of decreased speech discrimination ability. The findings established that a high positive pressure in the external meatus can result in a deterioration of the individual's ability to discriminate speech sounds.

Adult↗

PubMed1976

Hearing under stress: IV. a speech delivery communication system for utilization in high ambient noise environments.

Many communication systems have been devised to improve the individual's ability to receive speech information in the presence of ambient noise. The purpose of this study was to determine the effectiveness of a speech delivery system which combined a high degree of ambient noise attenuation with the ear's own natural amplification phenomenon--the occlusion effect. It was demonstrated that occlusion of the auditory system at the level of the external auditory meatus, in conjuction with bone-conducted speech stimuli presented at the mastoid, was most effective in providing high speech discrimination ability with significant attenuation of ambient noise.

Adult↗

PubMed1975

Gentamicin - Progressive cochlear toxicity.

Four patients with severe thermal burns showed Gentamicin cochlear toxicity. The hearing loss ranged from moderate to severe and was progressive in the three patients that were followed. These side effects were seen even with only topical application of Gentamicin to large surface burns of the body. All patients had an associated loss of bestibular function. None of the patients during treatment with Gentamicin was in renal failure. These finding are discussed in the light of current knowledge of Gentamicin toxicity, blood levels, and absorption from surface burns of the body.

Administration, Oral↗