Subject: Partial Loudness post doctoral position From: Roy Patterson <roy.patterson(at)MRC-CBU.CAM.AC.UK> Date: Fri, 17 Sep 1999 17:18:35 +0100Applications are sought for another 3-year post-doctoral position in auditory neuroscience at the Centre for the Neural Basis of Hearing in the Physiology Department of the University of Cambridge. This position arises from a Component Grant awarded by the Medical Research Council for the development of 'A time-domain model of loudness for stationary, dynamic and multi-source sounds.' (Roy Patterson, Physiology Dept., Cambridge; Brian Moore, Experimental Psychology Dept., Cambridge; Ray Meddis, Psychology Dept., Essex). Certain complex sounds produce the perception of multiple, simultaneous sources. Such sounds present difficult problems for traditional, spectral models of hearing, particularly when the perceived sources are associated with components that fall in the same frequency region. More recent, time-domain, models of hearing emphasise the auditory images produced by sounds and construct simulated images in which features of different sources appear in separate regions of the simulated auditory images. The task now is to extract the features and demonstrate that auditory images can be used for source segregation and analysis. We propose to begin with the problem of segregating complex tones and clicks from background noise, and to quantify the relative loudness of these components. The project involves (a) empirical determination of the partial loudness of the perceived sources in two sets of test stimuli (damped/ramped sounds and iterated rippled noise), (b) improving the accuracy of peripheral processing in the auditory image model (AIM) as part of the modelling programme at the Centre for the Neural Basis of Hearing, (c) calculating the partial loudness of the each perceived source from vectors in the auditory image, and (d) refining and developing the model by comparing the calculated partial loudness with the empirically measured partial loudness. For more details concerning the specific research associated with the post-doctoral position, contact Roy Patterson or Brian Moore __________________________________________________ Roy D. Patterson Centre for the Neural Basis of Hearing Physiology Department, University of Cambridge Downing Street, Cambridge, CB2 3EG phone 44 (1223) 333819 office phone 44 (1223) 333837 lab fax 44 (1223) 333840 department email rdp1(at)cam.ac.uk or email roy.patterson(at)mrc-cbu.cam.ac.uk http://www.mrc-cbu.cam.ac.uk/personal/roy.patterson/ http://www.mrc-cbu.cam.ac.uk/personal/roy.patterson/aim http://www.mrc-cbu.cam.ac.uk/personal/roy.patterson/cnbh