The Emotiv mind-reading headset, according to some reports, is ready for the real world. Sort of.
I think this controller has significant promise for those with disabilities. Instead of just thinking lazy game players would use it, imagine if a quadriplegic were to be able to use his or her computer to access the internet or communicate via email? Just by thinking where the cursor should move. Don't just focus on gaming. Think about the bigger picture!
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