If we hear a sound, how can we know if it came from in front, behind, above or below us? And how do headphones simulate this?

Question

If we hear a sound, how can we know if it came from in front, behind, above or below us? And how do headphones simulate this?

In: 7

Answer 1

A slight delay in how each ear receives a sound.

There’s something about the shape of the ears, the ridges and valleys that help with up/down direction.