The Experts below are selected from a list of 123 Experts worldwide ranked by ideXlab platform

T. Ren - One of the best experts on this subject based on the ideXlab platform.

  • Spontaneous Basilar Membrane Oscillation and Otoacoustic Emission at 15 kHz in a Guinea Pig
    Journal of the Association for Research in Otolaryngology, 2004
    Co-Authors: A.l. Nuttall, Karl Grosh, J. Zheng, E. Boer, Y. Zou, T. Ren
    Abstract:

    A Spontaneous Otoacoustic Emission (SOAE) measured in the ear canal of a guinea pig was found to have a counterpart in Spontaneous mechanical vibration of the basilar membrane (BM). A Spontaneous 15-kHz BM velocity signal was measured from the 18-kHz tonotopic location and had a level close to that evoked by a 14-kHz, 15-dB SPL tone given to the ear. Lower-frequency pure-tone acoustic excitation was found to reduce the Spontaneous BM oscillation (SBMO) while higher-frequency sound could entrain the SBMO. Octave-band noise centered near the Emission frequency showed an increased narrow-band response in that frequency range. Applied pulses of current enhanced or suppressed the oscillation, depending on polarity of the current. The compound action potential (CAP) audiogram demonstrated a frequency-specific loss at 8 and 12 kHz in this animal. We conclude that a relatively high-frequency Spontaneous oscillation of 15 kHz originated near the 15-kHz tonotopic place and appeared at the measured BM location as a mechanical oscillation. The oscillation gave rise to a SOAE in the ear canal. Electric current can modulate level and frequency of the Otoacoustic Emission in a pattern similar to that for the observed mechanical oscillation of the BM.

Alfred L. Nuttall - One of the best experts on this subject based on the ideXlab platform.

  • Spontaneous Basilar-Membrane Oscillation (SBMO) and Coherent Reflection
    Journal of the Association for Research in Otolaryngology, 2006
    Co-Authors: Egbert Boer, Alfred L. Nuttall
    Abstract:

    In a previous report (in JARO) we have described a relatively high-frequency (15 kHz) Spontaneous oscillation of the basilar membrane (SBMO) in a guinea pig ear; this oscillation was accompanied by a Spontaneous Otoacoustic Emission (SOAE) at the same frequency. During the Spontaneous oscillation and after it had subsided, the mechanical frequency response of the basilar membrane was measured by way of a wide-band random-noise stimulus, and it showed a number of spectral peaks, one of which having the frequency of the original oscillation. This pattern of peaks cannot be explained by assuming a single place of reflection in the cochlea. In this paper the process of ‘coherent reflection’ is artificially evoked in a three-dimensional model of the cochlea by imposing random place-fixed irregularities to the basilar-membrane impedance. It is shown that in the model a series of peaks arises in the frequency spectrum of the basilar-membrane response which phenomenon resembles the one found in the experimental animal. It is also shown that these peaks are actually due to superposition of the primary wave and a wave resulting from ‘coherent reflection’ which is reflected at the stapes. When the intensity of the acoustic stimulus signal is increased, the relative sizes of these peaks in the simulation diminish in about the same way as in the experiment. It is concluded that coherent reflection most likely is the cause of the ‘extra peaks’, and that this concept can also explain the observed level dependence of these peaks. The findings of this study lead to a minor refinement regarding the actual requirements for coherent reflection to arise.

A.l. Nuttall - One of the best experts on this subject based on the ideXlab platform.

  • Spontaneous Basilar Membrane Oscillation and Otoacoustic Emission at 15 kHz in a Guinea Pig
    Journal of the Association for Research in Otolaryngology, 2004
    Co-Authors: A.l. Nuttall, Karl Grosh, J. Zheng, E. Boer, Y. Zou, T. Ren
    Abstract:

    A Spontaneous Otoacoustic Emission (SOAE) measured in the ear canal of a guinea pig was found to have a counterpart in Spontaneous mechanical vibration of the basilar membrane (BM). A Spontaneous 15-kHz BM velocity signal was measured from the 18-kHz tonotopic location and had a level close to that evoked by a 14-kHz, 15-dB SPL tone given to the ear. Lower-frequency pure-tone acoustic excitation was found to reduce the Spontaneous BM oscillation (SBMO) while higher-frequency sound could entrain the SBMO. Octave-band noise centered near the Emission frequency showed an increased narrow-band response in that frequency range. Applied pulses of current enhanced or suppressed the oscillation, depending on polarity of the current. The compound action potential (CAP) audiogram demonstrated a frequency-specific loss at 8 and 12 kHz in this animal. We conclude that a relatively high-frequency Spontaneous oscillation of 15 kHz originated near the 15-kHz tonotopic place and appeared at the measured BM location as a mechanical oscillation. The oscillation gave rise to a SOAE in the ear canal. Electric current can modulate level and frequency of the Otoacoustic Emission in a pattern similar to that for the observed mechanical oscillation of the BM.

Egbert Boer - One of the best experts on this subject based on the ideXlab platform.

  • Spontaneous Basilar-Membrane Oscillation (SBMO) and Coherent Reflection
    Journal of the Association for Research in Otolaryngology, 2006
    Co-Authors: Egbert Boer, Alfred L. Nuttall
    Abstract:

    In a previous report (in JARO) we have described a relatively high-frequency (15 kHz) Spontaneous oscillation of the basilar membrane (SBMO) in a guinea pig ear; this oscillation was accompanied by a Spontaneous Otoacoustic Emission (SOAE) at the same frequency. During the Spontaneous oscillation and after it had subsided, the mechanical frequency response of the basilar membrane was measured by way of a wide-band random-noise stimulus, and it showed a number of spectral peaks, one of which having the frequency of the original oscillation. This pattern of peaks cannot be explained by assuming a single place of reflection in the cochlea. In this paper the process of ‘coherent reflection’ is artificially evoked in a three-dimensional model of the cochlea by imposing random place-fixed irregularities to the basilar-membrane impedance. It is shown that in the model a series of peaks arises in the frequency spectrum of the basilar-membrane response which phenomenon resembles the one found in the experimental animal. It is also shown that these peaks are actually due to superposition of the primary wave and a wave resulting from ‘coherent reflection’ which is reflected at the stapes. When the intensity of the acoustic stimulus signal is increased, the relative sizes of these peaks in the simulation diminish in about the same way as in the experiment. It is concluded that coherent reflection most likely is the cause of the ‘extra peaks’, and that this concept can also explain the observed level dependence of these peaks. The findings of this study lead to a minor refinement regarding the actual requirements for coherent reflection to arise.

Karl Grosh - One of the best experts on this subject based on the ideXlab platform.

  • Spontaneous Basilar Membrane Oscillation and Otoacoustic Emission at 15 kHz in a Guinea Pig
    Journal of the Association for Research in Otolaryngology, 2004
    Co-Authors: A.l. Nuttall, Karl Grosh, J. Zheng, E. Boer, Y. Zou, T. Ren
    Abstract:

    A Spontaneous Otoacoustic Emission (SOAE) measured in the ear canal of a guinea pig was found to have a counterpart in Spontaneous mechanical vibration of the basilar membrane (BM). A Spontaneous 15-kHz BM velocity signal was measured from the 18-kHz tonotopic location and had a level close to that evoked by a 14-kHz, 15-dB SPL tone given to the ear. Lower-frequency pure-tone acoustic excitation was found to reduce the Spontaneous BM oscillation (SBMO) while higher-frequency sound could entrain the SBMO. Octave-band noise centered near the Emission frequency showed an increased narrow-band response in that frequency range. Applied pulses of current enhanced or suppressed the oscillation, depending on polarity of the current. The compound action potential (CAP) audiogram demonstrated a frequency-specific loss at 8 and 12 kHz in this animal. We conclude that a relatively high-frequency Spontaneous oscillation of 15 kHz originated near the 15-kHz tonotopic place and appeared at the measured BM location as a mechanical oscillation. The oscillation gave rise to a SOAE in the ear canal. Electric current can modulate level and frequency of the Otoacoustic Emission in a pattern similar to that for the observed mechanical oscillation of the BM.