• Corpus ID: 2067540

Eyes as fenestrations to the ears: a novel mechanism for high-frequency and ultrasonic hearing.

@article{Lenhardt2007EyesAF,
  title={Eyes as fenestrations to the ears: a novel mechanism for high-frequency and ultrasonic hearing.},
  author={Martin L. Lenhardt},
  journal={The international tinnitus journal},
  year={2007},
  volume={13 1},
  pages={
          3-10
        }
}
  • M. Lenhardt
  • Published 2007
  • Medicine
  • The international tinnitus journal
Intense airborne ultrasound has been associated with hearing loss, tinnitus, and various nonauditory subjective effects, such as headaches, dizziness, and fullness in the ear. Yet, when people detect ultrasonic components in music, ultrasound adds to the pleasantness of the perception and evokes changes in the brain as measured in electroencephalograms, behavior, and imaging. How does the airborne ultrasound get into the ear to create such polar-opposite human effects? Surprisingly, ultrasound… 

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References

SHOWING 1-10 OF 46 REFERENCES
Ultrasonic hearing in humans: applications for tinnitus treatment.
  • M. Lenhardt
  • Physics
    The international tinnitus journal
  • 2003
TLDR
It is proposed that brain ultrasonic demodulation is the means of place-mapping ultrasound on the first few millimeters of the basilar membrane, and modeling and psychoacoustic data are presented in support of this theory.
Ultrasound activates the auditory cortex of profoundly deaf subjects
TLDR
The results suggest that extra-cochlear routes convey information to the primary auditory cortex and can therefore produce detectable sound sensation even in the profoundly deaf subjects, who reported a sensation themselves.
Response of human skull to bone-conducted sound in the audiometric-ultrasonic range.
TLDR
For designing high audio and ultrasonic tinnitus maskers and hearing aids, these results suggest that wide bandwidth must be used to compensate for the unpredictability of the resonances.
High Frequency Audiometry
TLDR
A new technique is described that uses a special electric transduction mode: a 60-kHz carrier frequency is modulated by the desired audiofrequency, which production and calibration of electrical high frequency signals, up to 20 kHz, is straightforward and easier than that of conventional air-conduction and bone- Conduction signals.
Use of high-frequency and muscle vibration in the treatment of tinnitus.
TLDR
Somatosensory stimulation in the form of low-frequency muscle vibration can also mask high-frequency tinnitus, and a clinically feasible technique has been identified for more wide-scale evaluation.
I Closure of the Cochlear Windows: Its Effect upon Air- and Bone-Conduction
TLDR
There is but a small, almost uniform opinion that closure of the round window causes the cochlear response to (or the hearing of) AC signals to diminish, as evidenced by audiological examination of patients with otosclerotic stapes fixation.
In Search of the Bone‐Conduction Threshold in a Free Sound Field
Several investigators have attempted indirect determination of the bone‐conduction threshold in a free sound field. It has recently become possible to attenuate sound transmitted through the auditory
Measurement of bone conduction levels for high frequencies.
TLDR
To assess safety of the UltraQuiet tinnitus treatment system, acceleration was measured from 5 to 20 kHz on a live human head as compared with calibrated levels at 6 kHz on an artificial mastoid and the live head and stimulation in the high audio frequencies at low levels was found to be safe.
Tinnitus improvement with ultra-high-frequency vibration therapy.
TLDR
All patients showed some long-term gains, and most exhibited relief in at least one measurement parameter, providing support for the use of high-frequency vibration in the treatment of tinnitus.
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