PMID: 8583425Jan 1, 1996Paper

Acoustic distortion products from the cochlea of the blind African mole rat, Cryptomys spec

Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
M KösslM Müller

Abstract

The measurement of distortion-product otoacoustic emissions is a noninvasive method that can be used for assessing the sensitivity and the frequency tuning of nonlinear cochlear mechanics. During stimulation with two pure tones f1 and f2, the acoustic 2f1-f2 distortion was recorded in the ear canal of Cryptomys spec. to study specializations in cochlear mechanics that could be associated with the presence of a frequency expanded cochlear region between 0.8-1 kHz. In addition, a distortion threshold curve was obtained which describes relative threshold of nonlinear cochlear mechanics. Sensitive distortion thresholds could be measured for stimulus frequencies between 0.4 to 18 kHz with a broad minimum between 0.75 to 2.5 kHz. The distortion threshold curve extends to higher frequencies than previous neuronal data indicated. As a measure of mechanical tuning sharpness in the cochlea, suppression tuning curves of 2f1-f2 were recorded. The tuning curves reflected the typical mammalian pattern with shallow low frequency and steep high frequency slopes. Their tuning sharpness was poor with Q10dB values between 0.3 and 1.88. In the range of the frequency expanded region, the Q10dB values were below 0.5. This finding emphasizes that the...Continue Reading

Citations

Nov 23, 2006·Die Naturwissenschaften·Simone LangeMathias Kawalika
Dec 8, 2010·Journal of the Association for Research in Otolaryngology : JARO·Christopher Bergevin
Jul 16, 2010·Hearing Research·Marianne Vater, Manfred Kössl
Feb 27, 2003·The European Journal of Neuroscience·Rafael Cernuda-CernudaWillem J DeGrip
Mar 13, 2019·The Journal of Comparative Neurology·Catherine M BaroneSonja J Pyott
Jun 1, 2000·The Journal of the Acoustical Society of America·D M Mills
Oct 28, 2021·The Journal of Experimental Biology·Kai R CasparSabine Begall

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