[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Implicit human echolocation
yes, the blindfold would substantially alter the HRTF. As a sighted
person, I still hate wearing any clothing with a hood (even if it isn't
noisy), or even a high collar (e.g sheepskin jacket with collar up).
I've even wondered wether wearing glasses interferes - it seems so to
me, though that may simply be because I'm not a regular glasses wearer -
I don't quite know if this is actually a psychoacoustic effect. Of
course, most of these effects would be on high frequencies.
Dr. Peter Lennox
Signal Processing Applications Research Group
University of Derby
Int. tel: 3155
>>> Thomas G Brennan <g_brennantg@xxxxxxxxxxxxxxx> 06/01/07 5:08 AM >>>
Facial vision is a term which is no longer used as the face has nothing,
itself, to do with echo location. However, as a long time user of echo
for everything from bike riding to skydiving I can tell you that
face as with a blindfold does effect echo location (especially passive
because it changes the texture and echo characteristics of the face. A
situation is seen in either enucleation or eviseration particularly when
eyes are involved. So far as I know, the type of implant used makes no
difference as is the case with the type of prosthetic since materials
glass, granet, etc. are no longer used.
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html
On Thu, 31 May 2007, Harry Erwin wrote:
> Date: Thu, 31 May 2007 08:50:37 +0100
> From: Harry Erwin <harry.erwin@xxxxxxxxxxxxxxxx>
> To: AUDITORY@xxxxxxxxxxxxxxx
> Subject: Re: Implicit human echolocation
> The phenomenon is known as facial vision. Dr. Lawrence Scadden could
> do it well enough to ride a bicycle in traffic despite his total
> blindness. He was a participant in at least one published study.
> Most people who use it use passive echolocation as schools for the
> blind discouraged their students in the past from making echolocation
> sounds. Humans can also use active echolocation, but not with the
> range accuracy of bats. I've used passive echolocation. Sighted
> humans are about as accurate as bats in azimuth and elevation.
> It's effortful. Once you've memorised your environment, you prefer to
> operate by dead reckoning, which means you don't notice changes
> unless they're obvious. This phenomenon is also seen in bats and
> rodents, and Don Griffin discussed it in Listening in the Dark.
> Harry Erwin, PhD, Senior Lecturer of Computing, University of
> Sunderland. Computational neuroethologist:
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email