CAHR at DAGA

Monday 19 Mar 12

Contact

Torsten Dau
Head of Sections, Professor
DTU Health Tech
+4545 25 39 77

Contact

Bastian Epp
Associate Professor
DTU Health Tech
+4545 25 39 53

German students and professors from CAHR will be attending and presenting at the 38th Meeting of the German Acoustical Society (DAGA) in Darmstadt (www.daga2012.de) from Mar 19-22, 2012.

The ability to perceptually separate acoustic sources and focus one’s attention on a single source at a time is essential for our ability to use acoustic information. As part of his PhD project, Simon Christiansen has developed an auditory stream segregation model.  This model is based on a physiologically inspired model of human auditory processing (Jepsen et al., 2008) and uses a temporal coherence analysis across neural channels to determine stream segregation (as inspired by Elhilali et al., 2009).  His model is able to quantitatively account for classical streaming phenomena relying on frequency separation and tone presentation rate, such as the temporal coherence boundary and the fission boundary (van Noorden, 1975). The same model also accounts for the perceptual grouping of distant spectral components in the case of synchronous presentation. Torsten Dau will be presenting some results from this model in a talk on Tue., Mar 20.

 

Physiological studies have found neurons in the auditory system that are sensitive to changes in location of a sound (e.g, a moving sound source). The detection of motion presumably plays an important role in the analysis of complex acoustical scenes in natural environments. Through a collaborative study with colleagues in Germany, Bastian Epp has investigated human sensitivity to the motion of sound. The results of this work will be presented on Tue., Mar 20.

 

Our ability to detect low intensity sounds is traditionally measured in an audiogram at fixed frequencies approximately an octave apart. However, an individual’s threshold of hearing can vary significantly between the frequencies sampled in the audiogram.  This variation, referred to as threshold fine structure, affects perception of sounds with low intensities like the perception of modulations, loudness or the detection of pulsed tones. The threshold of pulsed tones not only depends duration of the tone, but also whether the frequency of the tone coincides with a minumum or a maximum of threshold fine structure. In his talk on Wed., Mar. 21, Bastian Epp presents how the combination of a nonlinear and active model of the cochlea can be used to explain behavioural data and which aspects can be attributed to cochlear vs. neural processing.

 

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

 

Torsten Dau, Simon Christiansen, Morten Jepsen “A computational model of auditory stream segregation based on a temporal coherence analysis” Tue., Mar 20, 14:00.

 

Jesko Verhey, Bastian Epp, Stephan Klockgether. "Untersuchung zur akustischen Bewegungswahrnehmung mit Hilfe des auditorischen Moments (Investigation of auditory motion detection using the auditory momentum)". Tue., Mar 20, 14:50.

 

Bastian Epp, Jesko Verhey, Manfred Mauermann. "Simulationen zur zeitlichen Integration nahe der Ruhehörschwelle mit Feinstruktur (Simulations on temporal integration near threshold in quiet with fine structure)". Wed., Mar 21, 16:55.