Separate names with a comma.
Let me answer to you with the following quote:
The left to right placement is in the mix. The mix is designed to be heard from speakers 10 to 12 feet in front of you. The distance from the speakers to the listening position create the space for the soundstage to exist in. Moving your head allows you to perceive that distance. Is that clearer?
Sorry, but it's complete bull$hit.
Here you go... You can also try googling sound localization. http://asa.scitation.org/doi/abs/10.1121/1.4800148
Apparently, also I am not in the database. All your sound come from behind or from the sides, did listen to them all. Sorry. If I close my eyes and a friend snaps the fingers either in fromt or behind me, it is absolutely unambiguous. I fear there is presently something not understood at all, it is not only frequency dostortion, maybe it is a contribution ob bone sound, sound going through the eustachian channel, or jet undiscovered sound receptors in the nose (who knows...).
No, it also works perfectly without movinf the head - for real sounds like finger napping with closed eyes.
No, at least not for short sounds, like single clicks or drops. They are over before you can turn your head. Still, one can determine their direction most precisely, of all accoustic events (it is probably the most important case of directional hearing, the broken twig under the pawn of the tiger).