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Biomedical subjects

H Hollien

Publications and source records attributed to H Hollien.

At least 37 records · Page 2Linked to original sources
PubMed1980

Speech intelligibility at high helium-oxygen pressures.

Word-list intelligibility scores of unprocessed speech (mean of 4 subjects) were recorded in helium-oxygen atmospheres at stable pressures equivalent to 1600, 1400, 1200, 1000, 860, 690, 560, 392, and 200 fsw daring Predictive Studies IV-1975 by wide-bandwidth condenser microphones (frequency responses not degraded by increased gas density). Intelligibility scores were substantially lower in helium-oxygen a 200 fsw than in air at l ATA, but there was little difference between 200 fsw and 1600 fsw. A previously documented prominent decrease in intelligibility of speech between 200 or 600 fsw because of helium and pressure was probably due to degradation of microphone frequency response by high gas density.

Adult↗
PubMed1977

Voice fundamental frequency levels of divers in helium-oxygen speaking environments.

Divers under hyperbaric conditions experience a marked deterioration in speech intelligibility. Included among the possible features that contribute to speech degradation is change/distrotion of speaking fundamental frequency (SFF). Based on the physics of the environment and the physiology of the diver, it would not be expected that SFF would change as a function of varying helium-oxygen pressure conditions. However, in an earlier pilot study, a rise in SFF was found with increases in depth. To test this hypothesis, and to expand the previous limited findings, a large number of U. S. Navy divers were studied. The diver/subjects produced speech samples at the surface and at depths of 200, 450, and 600 fsw in helium-rich environments. The resulting data revealed increases in fundamental frequency to the 450-fsw depth and a subsequent decrease at 600 fsw; further analysis, however, based on data transforms, showed a more linear increase in SFF. From other observations, it was judged that behavioral rather than physical conditions were the primary cause of these SFF shifts; specifically, they appear to have resulted from divers' attempts to speak more intelligibly.

Atmosphere Exposure Chambers↗
PubMed1976

Status report on instrumentation useful for craniofacial research.

This report reviews briefly State-of-the-Art of certain bioengineering instrumentation useful in craniofacial research and assessment. Brief reviews are included in the areas of Radiography, Electromyography, Intra-oral air flow/pressure, Lingual/palatal pressure, Oral-sensory perception, Visualization techniques, Acoustic processing, and Digital Computers. It should be obvious, even from this limited effort, that the variety and quality of available equipment is expanding rapidly. While it is conceded that there probably have been no abrupt or profound instrumental breakthroughs in any of the areas discussed, the sum total of the advances being made in each of the cited areas, taken collectively, are impressive. It is quite evident that both the clinical and basic researcher now have at their command great quantities of equipment of excellent intrinsic quality that are appropriate for the types of assessment and research being carried out or contemplated. These devices are at a level of sophistication not dreamed of as little as 20 years ago. It is now necessary for the scientist and practitioner to exploit this wealth of facilities and to be prepared to utilize effectively the future instrumental advances that can be expected in this area.

Cineradiography↗