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  • 1
    Electronic Resource
    Electronic Resource
    The effects of low-frequency ultrasound on the inner ear: an electrophysiological study using the guinea pig cochlea (1993)
    Springer
    European archives of oto-rhino-laryngology and head & neck 250 (1993), S. 22-26 
    Details
    ISSN: 1434-4726
    Keywords: Low frequency ultrasound ; Inner ear electrophysiology ; Cochlear microphonics ; Action potentials ; Endocochlear potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary By examining 218 albino guinea pigs, electrophysiological methods were used to investigate the effects of low frequency ultrasound at moderate sound pressure levels after long-term exposure to the inner ear. From 10 kHz to 28 kHz, low frequency ultrasound below 100 dB SPL induced significant changes in cochlear microphonics, elevated thresholds and decreased maximum output voltage of action potentials and decreased absolute values of negative potentials of the endocochlear potentials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176943
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of 6 kHz tone exposure on inner ear function of the guinea pig: relation to changes in cochlear microphonics, action potential, endocochlear potential and chemical potentials of K+-ions and Na+-ions, using a double-barrel glass electrode (1994)
    Springer
    European archives of oto-rhino-laryngology and head & neck 251 (1994), S. 154-159 
    Details
    ISSN: 1434-4726
    Keywords: Noise exposure ; 6 kHz sound ; Inner ear function ; Cochlear microphonics ; Nerve action potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Using 97 male albino guinea pigs and applying electrophysiological methods, the effects of a 6 kHz tone were investigated at a moderate sound pressure level to the inner ear during a 24-h exposure time. Following exposure to the 6 kHz tone at 90 dB, cochleas showed decreased maximum output voltage of cochlear microphonics (CM) and action potential (AP). In the endolymph, K+ ion and Na+ ion concentrations remained unchanged during 40 min anoxia and 90 dB tone exposure. At 80 dB sound exposure decreases in maximum output voltage of CM and AP and decreases in the absolute value of EP could not be detected. Endolymph K+-ion Na+-ion concentrations were also unchanged. These findings indicate that diffusion potentials are induced at the same time as decreases of maximum output voltage in CM induced by exposure to sound at 90 dB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00181827
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Traffic-alarm sound monitor for aurally handicapped drivers (1987)
    Springer
    Medical & biological engineering & computing 25 (1987), S. 68-74 
    Details
    ISSN: 1741-0444
    Keywords: Aurally handicapped ; Alarm monitor ; Driving ; Electronic aid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract There are several countries in the world in which people with severe hearing loss are not eligible for a car driver’s licence. As a technical approach to solve this problem, an electronic device has been developed which detects traffic-alarm sounds, i.e. horns of cars, sirens of emergency vehicles, and alarm signals of railway crossings, and then displays them as a light signal to the driver. The basic operating principle of the device is that those traffic-alarm sounds have sharp line spectra in the frequency domain whereas ambient traffic noise is wide-band random noise. The real time detection of the line spectra, masked by random noise, is realised by use of a phase-locked loop and a simplified lock-in amplifier. The results of simulation experiments and road tests demonstrate that the performance of the device is satisfactory except in the case of the detection of the alarm signal of a railway crossing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442823
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    Paper (German National Licenses)
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