The direction dependant comb filtering caused by the angle of incidence / shape of the pinna will also change when you cock your head adding further localisation cues
On 13 December 2015 at 10:05, Steven Boardman <[email protected]> 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. > 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. > To talk of elevation is only relative, as pointed out by sleep.... > > 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[ < > >> https://en.wikipedia.org/wiki/Wikipedia:Vagueness> 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?) > >>> > >>> _______________________________________________ > >>> Sursound mailing list > >>> [email protected] > >>> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe > here, > >>> edit account or options, view archives and so on. > >>> > >>> > >>> > >> > >> > >> > >> > >> > > > > _______________________________________________ > > Sursound mailing list > > [email protected] > > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > > edit account or options, view archives and so on. > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20151213/e1fa85cb/attachment.html > > > _______________________________________________ > Sursound mailing list > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -- www.augustineleudar.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20151213/f1492d34/attachment.html> _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
