A neat little effect:

Moore says,

If two successive sounds are heard as fused, the location of the total sound is determined largely by the location of the first sound. This is known as the “precedence effect”, although it has been called the “Haas effect”…

This, among other things, stops you getting confused when a sound comes at you from two speakers at once.

Now, if you drop something and record the sound, and then play it back backwards, you can hear the echos that are normally masked.

(Thanks to Nicol, and his supervisor, for the info)

There is more, of course, in the book

B.C.J. Moore, An Introduction to the Psychology of Hearing, 5th Ed., Academic Press, San Diego (2003).