The April 1994 issue of Esquire magazine has an article on Tony
Robbins. Part of the article states the following:

"You remove the electrodes from your scalp and arise. The electrodes
are connected to a machine, about the size of a radio, called
Electra-Sleep. Through the night it flooded your brain with electrical
impulses, herding the right and left hemispheres into one entity,
driving you down into a deep slumber where the silence is profound."

What’s the story with these machines?

What are they supposed to do?

Do they work?

Are they safe?

What is the best type or brand to get?

How much are they?

Can they be bought in Australia?

"LifeTools is Europe's largest mail order supplier of light and sound
devices; lucid dreaming machines; and other devices, tapes and CDs for
exploring and developing your inner mind, relaxing you deeply, helping
you sleep better, boosting your energy, improving your memory, lifting
confidence, and much more! We're based in England and we despatch all
over the world!"
http://www.lifetools.com/

I have no first hand experience, but my guess is they occasionaly do
one of the advertised claims, and they are not safe Your description
of how the work sounds like technobable.   Neil

Of interest to you might be MindDrive, a device that allows you to
control a computer screen,etc., using your thoughts. It works by
measuring
physiological changes of the skin transferred through a cuff slipped
over the finger.

Ran across your question about mind machines. I used them for years in
my success mentoring clinic in California...along with a
remote-sensing EEG and the Monroe Hemi-Sync tapes. Yes...these devices
do indeed yield many of the reported benefits. But you often have to
"ease into" them. If you're curious, I have posted some useful
articles at http://www.quantum-self.com/home.htm.