CAHR will be well represented at the 35th MidWinter Meeting of the Association for Research in Otolaryngology (ARO).

Thursday 23 Feb 12

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Bastian Epp
Associate Professor
DTU Health Tech
+45 45 25 39 53

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Torsten Dau
Head of Sections, Professor
DTU Health Tech
+45 45 25 39 77

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Sébastien Santurette
Affiliated Associate Professor
DTU Health Tech

 CAHR will be well represented at this year's meeting being held in San Diego, CA, USA from Feb. 25-29.  Several members from CAHR will be presenting their research on a wide range of topics:

 

Otoacoustic emissions (OAEs) are sounds produced by the ear and have the potential for advanced diagnostic clinical tests of hearing.  One test that has been proposed is the evaluation of the tuning of auditory filters based on the latency of tone burst OAEs (TBOAEs).  In her talk on Sat., Feb. 25, Sarah Verhulst will identify potential problems with this technique and how they might be solved.  On the same day, Bastian Epp will present a poster discussing the relationship between stimulus-frequency OAEs (SFOAEs) delay and frequency selectivity.

 

If we are presented with a sound signal from two locations, but with one signal delayed slightly in time, we perceive the sound as coming from one source.  Federica Bianchi studied this phenomenon, known as the precedence effect, in her MSc thesis.  Her work, demonstrating that the main characteristics of the perceptual precedence effect can be attributed to monaural lag-suppression at the cochlea and brainstem level, is presented in a poster on Sat., Feb. 25.

 

The audibility of important sounds in natural acoustical environments is often hampered due to the presence of other masking sounds. The amount of masking depends on characteristics of the sound sources such as spatial position and spectrotemporal properties of the emitted signals.  For example, our auditory system can make use of coherent level fluctuations in different frequency regions (comodulation) to help separate sound sources.  In posters on Sun., Feb. 26 and Tue., Feb 28, Bastian Epp will present some of his work investigating the level at which some of this auditory processing occurs.

 

To properly localize sound in both direction and distance, we make use of a variety of binaural acoustic cues such as interaural level differences (ILDs) and interaural time differences (ITDs).  While these spatial cues are available in their natural form when listening to real-world sound sources, hearing-aid signal processing, such as wide dynamic range compression, affects the ILDs and thereby potentially reduces the perceived degree of externalization.  As part of her PhD research, Jasmina Catic has been examining how room acoustics influence these binaural cues and the effects this has on perception.  Some of her work will be presented in a poster on Mon., Feb. 27.

 

Details of talks and posters presented by CAHR researchers (in bold):

 

Sarah Verhulst, "Understanding the Tone-Burst Otoacoustic Emission Latency Estimate," Session D, Talk #34, Sat. Feb. 25.

 

Bastian Epp, Christopher Bergevin, and Christopher Shera, "Relationships Between Cochlear Tuning and Delay Probed with a Nonlinear Transmission-Line Model," Session E15, Poster #201, Sat. Feb. 25.

 

Federica Bianchi, Sarah Verhulst, and Torsten Dau, "Behavioral and Objective Measures of the Precedence Effect," Session E7, Poster #106, Sat. Feb. 25.

 

Bastian Epp, Ifat Yasin, and Jesko L. Verhey, "Interrelation Between Sensation Level and Auditory Evoked Potentials Under Conditions of Masking Release," Session M11, Poster #414, Sun. Feb. 26.

 

Jasmina Catic, Sebastien Santurette, Jörg Buchholz, and Torsten Dau,, "Effects of Interaural Level and Time Differences on the Externalization of Sound," Session S10, Poster #654, Mon. Feb. 27

 

Jesko Verhey, Ian Winter, and Bastian Epp, "Comodulation Is a Stronger Binding Cue Than the Common Fate of Frequency Swept Components," Session Z18, Poster #1058, Tue. Feb. 28.