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" <st...@mail.telepac.pt> 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 <st...@mail.telepac.pt> >> 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 >>> Sursound@music.vt.edu >>> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, >>> edit account or options, view archives and so on. >>> >>> >>> >> >> >> >> >> > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > 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 Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
