Re: [EXTERNAL] Frequency dependecy of sound localization ("Gallun, Frederick J. (Portland)" )

Subject: Re: [EXTERNAL] Frequency dependecy of sound localization
From:    "Gallun, Frederick J. (Portland)"  <Frederick.Gallun@xxxxxxxx>
Date:    Sat, 5 Apr 2014 14:39:42 -0700

Hello Junfeng, The issue of combining information across frequency for sound localization has a long history. Much of the work has involved what is described as "binaural interference", in which low frequency sounds tend to dominate high frequency sounds. In our 2007 paper (Best et al., 2007) we demonstrated that interference can be influenced by factors that relate to auditory grouping, and that this insight helps to organize some of the contradictions in the literature. If you wish to develop a theory of frequency importance functions, it will be important to consider this aspect. This paper contains what we attempted to provide as the most comprehensive review of the literature up until 2007, as part of our attempt to use an auditory scene analysis framework to organize the results up to that point. I think it will be useful to you regardless of whether you are interested in our auditory grouping hypothesis or not. Best, V., Gallun, F. J., Carlile, S., & Shinn-Cunningham, B. G. (2007). Binaural interference and auditory grouping. The Journal of the Acoustical Society of America, 121(2), 1070-1076. Key papers that have been published subsequent to our review in that paper include: Lee, A. K., Deane-Pratt, A., & Shinn-Cunningham, B. G. (2009). Localization interference between components in an auditory scene. The Journal of the Acoustical Society of America, 126(5), 2543-2555. Heller, Laurie M., and Virginia M. Richards. Binaural interference in lateralization thresholds for interaural time and level differences. The Journal of the Acoustical Society of America 128.1 (2010): 310-319. Croghan, N. B., & Grantham, D. W. (2010). Binaural interference in the free field. The Journal of the Acoustical Society of America, 127(5), 3085-3091. Please feel free to contact me off-list if there are is anything more I can add. Erick ------------------------------------------------------- Frederick (Erick) Gallun, PhD Research Investigator, National Center for Rehabilitative Auditory Research Associate Professor, Dept. of Otolaryngology and Neuroscience Graduate Program Oregon Health & Science University National Center for Rehabilitative Auditory Research Portland VA Medical Center 3710 SW US Veterans Hospital Road (NCRAR) Portland, Oregon 97239 Frederick.Gallun@xxxxxxxx -----Original Message----- From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx On Behalf Of Li Junfeng Sent: Thursday, April 03, 2014 2:04 AM To: AUDITORY@xxxxxxxx Subject: [EXTERNAL] Frequency dependecy of sound localization Dear all, As all of you may know, human sound localization is a quite complex procedure and highly dependent on the ITD, ILD, spectral cues and others. All these cues are encoded in HRTF. Many previous studies have shown that for horizontal sound localization, ITD play a important role in the low frequencies and ILD is dominant cue in the high frequencies; for vertical sound localization, spectral cues in the high frequencies are normally important. Thess are already known knowledge. >From the previous research results, I beleive that different frequencies should contribute differently to horizontal and vertical sound localization. Furthermore, I am now wondering how we can quantify this difference, that is, is there a quantitative way to describe the different contribution of different frequencies to sound localization. (As you may know, in speech perception field, the band-importance functions quantify the contribution of different frequencies to speech intelligibility). I am also looking for the frequency/band-imporance functions which describe the contribution of different frequencies to human sound localization. Does anyone know some work on this research to recommend or some ideas to share? I would like to appreciate any discussions and references very much. Thanks a lot. Best regards, Junfeng

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