Mark Kinsler wrote in 031215 MMDigest:

> Scientific American magazine ran an article back in the 1970's
> about experiments with headphones.  Put 440 Hz into one ear,
> put 442 Hz into the other.  Do you hear beats?  Turns out that it
> depends on the person and that this ability has some considerable
> significance in brain research.

Interesting!   Some years ago, I had a computer program that played
a pretty Bach tune using the Celeste effect (which I am very fond of).
When I edited the program to use separate right and left channels, the
Celeste effect completely disappeared!  I must hear the two slightly
different pitches in the same ear to get the effect.

Now I wonder what that tells about my brain, personality, modes of
thinking, etc.!

Mike Knudsen