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Re: Implicit human echolocation

I wonder if someone versed in Ecological testing methods might be able
to devise tests to discover the effect of glasses on HRTFs in real-world
applications? - John Neuhof- are you still out there?

Dr. Peter Lennox
Signal Processing Applications Research Group
University of Derby
Int. tel: 3155

>>> <g_brennantg@xxxxxxxxxxxxxxx> 01/06/2007 14:49 >>>
Peter, I've done a few studies with blind folks that I've never
published as its
difficultish for an individual to publish alonw.  I have found glasses
to be
problematic in the real mobility world.  One problem with lab studies
is that
you don't have real world inputs and the signals become so
undifferentiated that
they can be hard to hear, especially in the case of "passive" echo
which is really not passive at all or we wouldn't be able to hear it. 
I have
some frequency spread data that I've published in an o&m book that
approximately where some frequency splits are for differing kinds of
location tasks.  Both the frequencies that I believe are used as well
as how you
process the sounds differ for different tasks and in different
What really made me a believer in cultural echo location (I like that
term) is
spending some time in Mexico working with some blind children there. 
Even snow
creates such a different environment that echo location skills must
nearly be
thrown out the window and relearned for snow specific environments and
even then
you almost have to use active location and it doesn't do much good.


Tom Brennan  KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html 

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