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The influence of the acoustic stimulus on postural stability

Majewska A., Kawałkiewicz W., Hojan-Jezierska D., Jezierska A., Kubisz L.

Acta of Bioengineering and Biomechanics

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2017

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Vol. 19, no. 2

113--119

EN

The purpose of this study was to assess if 65 dB and 4000 Hz stimuli affect postural stability of young normal hearing people. Methods: Posturography examinations belong to clinical tests which evaluate the motor skills. Posturography can be divided into static posturography and dynamic posturography. In both, static posturography and dynamic posturography, patient stays on the platform with opened and closed eyes, but in the case of dynamic one, platform is unstable. In this study the Multitest Equilibre platform produced by FRAMIRAL was used. Patients took part in tests with opened and closed eyes, on stable and unstable platform. Additionally patients were exposed to 65 dB and 4000 Hz acoustic stimuli. The sound pressure level, and frequency was belonging to the best audibly frequency range. Results: Parameters such as velocity and surface were examined. The difference between velocity measured with acoustic stimuli and without acoustic stimuli was observed. On the other hand there was no difference in surface results. Conclusions: The statistically significant difference between velocity of patients center of gravity movements, measured on unstable platform, in the presence of 4000 Hz, 65 dB acoustic stimulus and without additional disturbances was observed.

2

Perception of fast time fluctuations in the sound level by persons with a cochlear implant

Kwiatkowski R., Hojan E., Szyfter W., Furmann A., Hojan-Jezierska D.

Archives of Acoustics

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2008

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Vol. 33, No. 4

423-434

EN

The paper presents results of scaling of loudness changes of natural sounds for persons with a cochlear implant by the so-called NSLE method. The possibilities of the use of this method of loudness scaling of natural sounds in the rehabilitation of persons with a cochlear implant have been analysed.

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A natural sound loudness estimation method as a perspective tool for hearing aid fitting in patients with dead cochlear regions

Hojan-Jezierska D., Skrodzka E., Hojan E.

Archives of Acoustics

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2007

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Vol. 32, No. 3

511--516

EN

Hearing aids fitted with the use of classical methods (POGO, NAL, Berger ect.) often do not bring the expected benefit to hearing impaired people with “dead regions”, (DRs). For such patients we propose an alternative method of hearing aids fitting, based on perception of natural sounds – The Natural Sounds Loudness Estimation (NSLE) method. Our aim was to check whether patients with such a complicated hearing loss were able to follow loudness changes in the sound material. Four persons (seven ears) with diagnosed DRs were examined. Only one of them was not able to perform the loudness estimation test with satisfactory precision (calculated as a correlation coefficient between sound pressure changes on an original sound track and subjectively perceived changes in loudness). Next, the parameters necessary to proper hearing aid fitting were calculated using the NSLE. Estimated insertion gains (IGs) were generally lower than those predicted by three classical methods used for comparison. Our conclusion is that the NSLE method may be a good option for hearing aids fitting in the case of people with DRs.

4

Investigations into speech intelligibility in the presence of different masking noises for hearing aids with variable attack and release times

Hojan E., Fastl H., Malenda J., Hojan-Jezierska D.

Archives of Acoustics

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2005

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Vol. 30, No. 2

159-171

EN

People with hearing impairments experience a reduction in speech intelligibility in noisy surroundings. The extent of this reduction depends on the degree of impairment in the temporal resolution of the patient's ear, too. The change of the speech intelligibility of hearing-impaired people was investigated in the presence of different masking noises, especially when using hearing aids with adjustable attack (AT) and release (RT) times within same frequency bands.