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maia comments on A Viable Alternative to Typing - Less Wrong
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Could you give an example/link? It never occurred to me that this might be something I could buy as of now.
The Emotiv epoc headset is pretty decent. I've worked with it at my university with a couple of BCI set ups, though I've not worked with their software, so I wouldn't know how good that is.
This is a device I got in December 2010, for IIRC $130. It detects tension ("grrr"), eye movement, and some other brain waves. In my experimentation with it, I found the brain wave modes hard to control, while the others were easier.
There was another model I saw that was $300, but I can't remember the name. The amazon page should get you started on finding related hardware.
Note: I haven't actually used a BCI with Dasher, it was just an idea I had for hands-free typing (and possible improvements in costs over existing tools for the disabled).