>Some two guys tried to produce a controlling gadget that used the
>electrical
>fields produced by the muscles moving the eye to detect eye movement
>and in
I think I remember something about this. It used conductive rubber
pads for the connections, and it was positioned something like
Seven of Nine's eyepiece. The EEG-style input was picked up through
the pads, since the pads were positioned around the eye socket.
Neat idea -- and for something requiring your eye to "touch" the device,
like a camera viewfinder, it's perfectly natural.
Otherwise, something like Seven's eyepiece *could* be reasonable.
My concern would be with *moving* the eye around to control something
which I would no longer be looking at. Of course, with an immersive
display it makes perfect sense.
>to build such device on their own, but found the parts (most
>important, the
>one detecting the fields) in some electronics store. I guess they
>From memory, there is an EEG circuit on the internet. I can't
remember the name of the project, but it was for a freeware EEG
system that hooked into a PC. Um, biofeedback control, etc were
the goals. It's been a few years since I looked at their site.
It needed an enormous amplification -- used an off the shelf op-amp
though, rather creatively. The hard part was differentiating between
the distinct signals, since the pads picked up more than just the field
specifically below the electrode. A matter of filtering it.
The principle is that the strongest signal is the one being received
by the muscle directly below the pad -- for EEG, accuracy was
of paramount importance. With a mouse controller, no big deal.
It might even be similar to the capacitive (or resistive) touchpad
controllers...just a different input source.
Don't remember much more than that...but it's a good starting point
if you want to play with the basic technology.
-- Chuck Knight
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