کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4356170 | 1615666 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impact of infrasound on the human cochlea
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کلمات کلیدی
infrasoundFFTSPLSNRTTSCNROHCsOAE - CESMnR - MNROtoacoustic emissions - انتشارات OtoacousticFast Fourier transform - تبدیل سریع فوریهTemporary threshold shift - تغییر آستانه موقتhearing level - سطح شنواییSound pressure level - سطح فشار صوتOuter hair cells - سلول های موی بیرونیmodulation index - شاخص مدولاسیونmodulation depth - عمق مدولاسیونlow frequency - فرکانس پایینamplitude modulation - مدولاسیون دامنهCochlear microphonics - میکروفونیک Cochlearsignal to noise ratio - نسبت سیگنال به نویز
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
سیستم های حسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Impact of infrasound on the human cochlea Impact of infrasound on the human cochlea](/preview/png/4356170.png)
چکیده انگلیسی
Low-frequency tones were reported to modulate the amplitude of distortion product otoacoustic emissions (DPOAEs) indicating periodic changes of the operating point of the cochlear amplifier. The present study investigates potential differences between infrasound and low-frequency sounds in their ability to modulate human DPOAEs. DPOAEs were recorded in 12 normally hearing subjects in the presence of a biasing tone with fBÂ =Â 6Â Hz and a level LBÂ =Â 130Â dB SPL. Primary frequencies were fixed at f1Â =Â 1.6 and f2Â =Â 2.0Â kHz with fixed levels L1Â =Â 51 and L2Â =Â 30Â dB SPL. A new measure, the modulation index (MI), was devised to characterise the degree of DPOAE modulation. In subsequent measurements with biasing tones of fB = 12, 24 and 50Â Hz, LB was adjusted to maintain the MI as obtained individually at 6Â Hz. Modulation patterns lagged with increasing fB. The necessary LB decreased by 12Â dB/octave with increasing fB and ran almost parallel to the published infrasound detection threshold. No signs of an abrupt change in transmission into the cochlea were found between infra- and low-frequency sounds. The results show clearly that infrasound enters the inner ear, and can alter cochlear processing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hearing Research - Volume 233, Issues 1â2, November 2007, Pages 67-76
Journal: Hearing Research - Volume 233, Issues 1â2, November 2007, Pages 67-76
نویسندگان
Johannes Hensel, Günther Scholz, Ulrike Hurttig, Dieter Mrowinski, Thomas Janssen,