There’s a headset in development that calibrates to human brainwaves, allowing one to manipulate images on a computer screen, just by thinking about them.
Emotiv Systems president Tan Le demonstrates it for a live audience at A Headset that Reads Your Brainwaves (if you’re impatient to see it work, forward about 5 minutes into the clip).

Photograph by Justin Stephens
Read an article here about Emotiv, the company that created the headset.
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