Steven Boardman wrote:
Some animals do not need to do this as much, as their ears aren't level.
One ear canal is higher than the other. Owls are an example of this. It
allows them to get elevation cues without tilting quite as much. This is
also true of some humans, but a lot lot rarer, but we all have very slight
differences..
Also when the head is only rotated, it will produce timing differences at
the ears, for elevated sounds ahead or behind. It is only sounds directly
above or below that don't produce these differences.
Absolutely true. Not all elevation is at +-90ยบ ...
This is why a very slight head rotate and tilt (head cock) works so well.
Combined with the comb filtering effect, and differing floor reflections,
one would of thought we could be quite accurate.
The integrative view.
To talk of elevation is only relative, as pointed out by sleep....
I was thinking of proposing some "Special Relativity Theory of Human
Hearing". The (claimed) huge revolution would be that the median plane
(of human hearing) would be seen to be relative to the head orientation
of the human listener or sleeper, not to the earth surface. (The now
obsolete absolute reference, which really never made any sense in this
context...)
However, I couldn't sort out the complicated math behind my theory. (Not
yet!)
Is anybody on this list who is about as competent as David Hilbert
(in math, I mean), and could help me to formulate all the outstanding
equations? (And he/she is not supposed to claim ownership of MY theory
later, I would like to add... :-D )
Think only of all the < problematic > reflections and comb filter effects...
(In the meantime, I will publish my preliminary insights only on some
Swedish online forum, in Latin.)
Best regards,
Stefan
P.S.: One < critical > part would be c', which is the speed of sound in
vacuum.
Steve
On 13 Dec 2015 3:00 am, "Stefan Schreiber" <[email protected]> wrote:
Augustine Leudar wrote:
I think when you tilt your head - especially up - it allows interaural
level and time differences to come into play that arent normally available
for vertical soundsources. Basically the sound will hit one ear before the
other and louder. We all know thats the case for horizontal sounds - but I
think thats why we tilt our head up too.
https://en.wikipedia.org/wiki/Sound_localization
For sound localization in the median plane (elevation of the sound) also
two detectors can be used, which are positioned at different heights. In
animals, however, rough elevation information is gained simply by tilting
the head, provided that the sound lasts long enough to complete the
movement. This explains the innate behavior of cocking the head to
one side when trying to localize a sound precisely.
As simple as it gets...
Best,
Stefan
I suspect floor as well as
shoulder reflections count !
On 12 December 2015 at 22:06, Stefan Schreiber <[email protected]>
wrote:
Peter Lennox wrote:
Of course, the paradigm that excludes head-tilt - necessary to control
for
experimental variables, does mean that the experiment is not
representative
(what some people refer to as 'ecological validity') of real-world
localisation.
Given that, when I look around the lecture theatre, 40%+ have, at any
one
time, some head tilting, and many move their heads (apart from the ones
that are slumped forward on their chests), the "median plane" should
not be
conflated with "vertical"...:-)
All these students sleeping during lectures - damned, they damage our
most
elaborated vertical precedence theories!
And the ones who don't sleep, they are actually worse! Because the
dynamic
head-tilt problems are harder to deal with than the static ones...
:-X
St.
P.S.: Any real-world theory of acoustical localization will have to
consider head movements and related "perspective changes".
I bet that most people move their head somehow if they can't
determine very well from where some sound comes. (Turning your head to
the
suspected direction of some < relevant > sound source could be a natural
reaction. Biological behaviour pattern?)
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