I am sure we could get some answers by examining these devices:

http://www.amazing1.com/ultra.htm

Though those produce more negative effects, it's a starting point.
There's mention of 40KHz, but isn't that within the range of "conscious" human 
hearing anyhow? 

Also I own an ultrasonic dog barking deterrent (little wand called Easy 
Trainer, produces a barely-audible hum) that works well on animals and if I use 
it for more than five seconds or so I quickly feel "motion sick" and get a 
strange sort of headache.

As we do not own a dog anymore I could butcher the device and see what makes it 
tick if that would be of any help.

Perhaps there's an adjustable pot somewhere inside.

silver-list@eskimo.com wrote:
> i know that different ELF and ULF frequencies can produce different
physiological effects, but does anyone know which frequency does what?

Dennis


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