Biomedical subjects

J Kiessling

Publications and source records attributed to J Kiessling.

At least 55 records · Page 3Linked to original sources

PubMed1979

[On the interpretation of Békésy audiograms (author's transl)].

A group of 112 subjects with sensorineural hearing loss was checked by an audiological test battery consisting of: pure tone audiometry, SISI Test, tone decay test and fixed frequency Békésy audiometry. Classification of Békésy tracings by two audiologists showes good agreement when introducing a hybrid type I/II, which completes Jerger's classification system of types I--IV. The results of our investigation exhibit no significant differences of manual pure tone threshold and automatic tracing contrary to some other authors. Finally the correlation of diagnosis and type of Békésy audiogram is discussed.

Audiometry↗

PubMed1979

[The value of SISI test for audiological examination (author's transl)].

The reliability of SISI Test for audiological evaluation of hearing impairment is investigated basing on audiometric findings of 604 subjects. In addition to the dependence of SISI scores on the age of the subjects the influence of sound pressure level and frequency is discussed. Comparing SISI results with those of other differential diagnostic tests we find that SISI test tends to indicate haircell lesions even though other tests exhibit a different site of the lesion. Particularly in cases of uncertain, complex hearing impairments (noise plus other causes) SISI test frequently shows false-positive results. Therefore SISI scores should be interpreted carefully especially with regard to legal examination of noise induced hearing impairment.

Adult↗

PubMed1978

[The effect of noise trauma on speech discrimination in silence and under influence of party noise (author's transl)].

Speech audiometry investigations were carried out in silence and under action of cocktail party noise in 44 soldiers. The testing subjects were grouped according to age and degree of noise lesion. The statistical evaluation of discrimination losses measured in silence and under acting party noise indicated that noise lesions induced considerable discrimination losses even in young subjects particularly under cocktail party noise conditions. Discrimination decreases significantly as the degree of noise trauma increases. In order to assess the real effect of the hearing loss caused by noise trauma upon speech discrimination, the tests of speech audiometry should be performed under noise conditions.

Adult↗

PubMed1978

[Dynamic range of acoustic reflex and its importance for hearing aid evaluation (author's transl)].

It is reported on the dynamic range of acoustic reflex in the case of normal hearing. Stimulation is carried out with speech noise under free field conditions. The sensitivity of impedance measurement is increased by using an averager, which enables acoustic reflex measurements at sound pressure levels of about 70 dB. Further an exact evaluation of input-output-characteristics becomes possible by this procedure. Basing on this consideration the possibility of objective hearing aid evaluation is discussed. The fundamental point of this technique should be the compensation of pathological input-output-characteristics by suitable hearing aids.

Ear, Middle↗

PubMed1977

[Reaction time and Békésy audiometry (author's transl)].

Electrophysiological work has elaborated that subjects having positive recruitment exhibit shorter response latencies than non-recruiting subjects do. Correspondingly we have investigated in this paper, if subjectively measured reaction times also decrease in case of recruiting subjects. Our measurements have shown that the averaged reaction time (at 4 kHz) of recruiting subjects is significantly (p = 0.05) shorter than the value of a non-recruiting group. Because of the interindividual scattering of the results, however, measuring of reaction time ist not suitable to distinguish subjects with loudness recruitment from those having no recruitment. Comparison of reaction time and Békésy audiogram as recruitment test shows Békésy tracing to be more reliable. Finally the number of oscillations (N) per octave in Békésy tracing is discussed as a function of oscillation width (W). A general mathematical representation of this correlation is given by N = a.Wb. Constants a and b, depending on attenuation rate (2.5 dB/s) and frequency change rate (1 oct./min), are evaluated by statistical and graphical methods (a = 36.08, b = -0.71).

Acoustic Stimulation↗

PubMed1977

[The reaction time as a source of error in threshold audiometry (author's transl)].

An investigation of reaction times at the threshold of hearing is described. 96 subjects were classified into two groups of sensorineural hearing loss utilizing Types I and II Bekesy audiometry, and compared with one normal group as control. The results show that reaction times are largely unaffected by the type of hearing loss and test frequency. Increasing age, however, may result in increasing reaction times. These results and possible sources of error are discussed as effecting an exact threshold audiometry.

Adult↗

PubMed1976

[Types of noise in audiometry-examples from theoretical and routine work (author's transl)].

The importance of noise types, which are used in audiometry, is pointed out and theory of noise is discussed. Besides practical examples of noise are compared with theoretical considerations. Comparison shows that exact theoretical definitions are mostly not fulfilled. In general, however, common types of noise are of satisfactory quality.

Audiometry↗

PubMed1974