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Re: Fwd: Re: apparent increase in loudness

I sent a posting to auditory list last year about this:

"In the New York Times magazine of March 23, 2003, there was a piece on
Woody Norris who works with highly directed sounds.  Apparently, the
military has interest in these as weapons.  It seems that the sound of a
baby crying played backwards mixed with some pure tones is actually
debilitating.  The author of the piece tries and it out and finds it to be
the case."

I have been doing some studies with time-reversed environmental sounds, one
of which is a baby crying, and none of my subjects has come screaming out
of the booth yet (in fact, it deson't that much different from the sound
played forward).   I have tried mixing the baby-crying-backwards-sound with
various pure tones (only on myself) and it sounded like a baby crying mixed
with a pure tone, not Bach, but hardly debilitating.

Brian Gygi

At 11:23 AM 1/30/2004 -0800, Ross Alexander Hendler wrote:

Some studies have shown that the sound of a baby crying can
actually be quite debilitating. I remember reading about these
studies performed by the American Technology Corporation
which incorporated the sound of a baby crying played
backwards and mixed with some pure tones.

I tried to find out more about what tones were used but got
the reply that "Unfortunately, the recording in question is the
the property of U.S. government and it is not a good idea for
ATC to disclose their full contents."

Ross A. Hendler