Frequency selectivity at very low centre frequencies: the influence of the helicotrema on individual differences in low-frequency sound perception

Carlos Andrés Jurado Orellana, Christian Sejer Pedersen, Torsten Marquardt

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

A significant factor in the decrease of sensitivity to low-frequency sound is the helicotrema shunt effect. In humans, it causes a slope increase of the middle-ear transfer function (METF) from 6 dB/oct to 12 dB/oct below approximately 50 Hz [Marquardt et al., J.Acoust. Soc. Am. 121, 3628-3638 (2007)]. Recent experiments showed that the exact frequency varies from individual to individual. Besides, the helicotrema region in the METF has been found to highly influence frequency selectivity for centre frequencies (CFs) below 80 Hz (Jurado and Moore in prep). By using individual METF measurements based on OAE suppression techniques and notched-noise masking data psychophysically measured for centre frequencies in the range 50-125 Hz, this study examines how individual differences in frequency selectivity, as well as in masking, may occur at very low CFs due to individual differences in the shape of the METFs, thought to be affected by the helicotrema impedance. Preliminary analysis indicates that individual differences in the METFs might underlay the observed individual differences in frequency selectivity. Main effects predicted by the calculations are a pronounced flattening off of the upper filter skirts and a shift in the tip, typically upwards in frequency, for auditory filters with CFs below about 80 Hz.
Original languageEnglish
Title of host publicationProceedings from 14th International Conference on Low Frequency Noise and Vibration and its Control
EditorsFlemming Christensen, Christian Sejer Pedersen
Place of PublicationAalborg
PublisherAcoustics, Department of Electronic Systems, Aalborg University
Publication date2010
Pages129-145
ISBN (Print)978-87-92328-33-5
Publication statusPublished - 2010
Event14th International Meeting on Low Frequency Noise and Vibration and its Control - Aalborg, Denmark
Duration: 9 Jun 201011 Jun 2010
Conference number: 14

Conference

Conference14th International Meeting on Low Frequency Noise and Vibration and its Control
Number14
CountryDenmark
CityAalborg
Period09/06/201011/06/2010

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