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Re: CASA problems and solutions

DeLiang Wang wrote:

> The replies by Al Bregman and John Culling suggest that location may not
even be
> a major cue for ASA.

This is true. Stuart Gatehouse and I did an extentsion of the work of
Culling and Summerfield (1995) in which listeners were required to segregate
sources based on spatial cues alone. This was presented at the Columbus 1999
meeting of the ASA (That's Acoustical Society of America). The listeners had
a rather high degree of difficulty doing the task and they found it even
more difficult with timing cues alone. Nevertheless, they could segregate
the sounds based on spatial cues alone, to varying degrees. I think it
supports the notion that segregating based on spatial cues is possible, but
by far not the most robust cue used by listeners. Harmonicity and coherent
temporal envelopes are probably much more powerful. Certainly, to succeed in
ASA, the human (or animal) combines all the cues.

If anyone would like a copy of our poster, send an address requesting a
copy. We are currently preparing a manuscript.

Ward Drennan
MRC Institute of Hearing Research

> I'd like to be proven wrong, so that at least we have one solution to
> rely on.