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Biomedical subjects

H G Demus

Publications and source records attributed to H G Demus.

11 recordsLinked to original sources
PubMed1992

[Evaluation of frequency selectivity from psychoacoustic tuning curves].

Psychoacoustic tuning curves (PTC) can be regarded as filter curves, whereas their forms represent hair cell activity. Different influences--for example, noise, toxins, pharmacological causes and age--can change the PTC as a consequence of changed frequency selectivity without indication of deterioration in the audiogram. The objective of this investigation was to determine the visually perceivable change in the PTC as a quantifiable result. In so doing, the PTC was transformed into a hyperbola characterized by a parameter Q5. An example demonstrates the temporal change of Q5 under the influence of pharmacological drugs.

Auditory Threshold↗
PubMed1990

[Relations between the summation potential and frequency selectivity].

In cases of inner ear diseases, e.g.m. Ménière, summation potential (SP) can be measured using the extratympanic elektrocochleographic method. This potential is a consequence of hydrops in the cochlea. In 128 patients with confirmed SP, it was also possible to measure frequency selectivity (FS) using the psychoacoustic method. Reduced FS was found to a greater or lesser degree in the basal and apical turn of the cochlea. It can be assumed that both phenomena are to be attributed to the same cause.

Audiometry, Evoked Response↗
PubMed1976

[Parameters of OEMG for Judgement of Facial Function (author's transl)].

In order to test the function of facial nerve in Bells palsy we used three methods, the function test of Schubert-Cobet, the nerve excitability test and the surface electromyography. We could find a correlation in the parameters of this methods in judgement of facial nerve function.

Electric Stimulation↗