Recently, I've decided to try and use stereo convolver plugin for fb2k with my modded Fostex T20RP. I've written a somewhat similar post in appropriate thread, but here I have a different question.
While trying different samples from IRCAM demo sound page (http://recherche.ircam.fr/equipes/salles/listen/sounds.html) I've noticed that I'm consistently unable to localise any sound in 10:30 to 03:00 region (12:00 being dead ahead). When sound source passes 10:30 boundary, it gets mirriored to 7:30 position and moves to 03:00 position in the rear hemisphere rather than front. There were also some cases with zero frontal localisation at all, with sound either mirrioring to rear hemisphere moving out of head, or even moving straight through head from ear to ear.
I have also tried to listen to "Holophonics - Matches" on youtube (http://www.youtube.com/watch?v=HprNPCRyP40), which had exactly the same effect. No problem with top-down localisation and localisation in the rear hemisphere at all.
I've thought that this may be due to headphones not having enough angle conflicting with my ears' shape, and posted about that in T50RP thread. However, since then, I've tried it also on SHP2700 headphone, also doing stuff such as lifting HP's up to 10 cm from ears, angling them, rotating them around the head so right earpiece is near 01:00 and left is at 7:00, etc, but the effect was always the same: complete left-right, top-down and distance localisation in read hemisphere and almost no localisation in front.
So it seems that the case is me. I've got no speakers, but tried to localise some other sound sources and seems that indeed I have problems locating sounds in front-right sector. However, I am probably now suffering from cognitive bias and cannot rely on what I feel. Though I'm rather sure that somewhat reduced high-frequency hearing on right ear is not a bias product (not extension, it's roughly equal to left ear (tried that once on headphones using SineGen), but level (in real life perception, not by test). However, that difference is slight.
The only objective measurement I have is that my left ear's pinna is parallel to head and doesn't stick out, while right one sticks out. Also I have had recurring otitis on left ear and have to use some drugs on it about once in a year.
So the question is: are there any home-reproducible scientific methods of determining hearing's spatial resolving capability? Or at least not home-reproducible, just for information. I've tried googling a bit, but haven't found anything straight out yet.