NeuroSky Inc. has developed a non-invasive, dry, bio-sensor family of products that capture the electrical waves generated by neurological activity and eye movements and translate mental state information into digital signals for simple Brain-Computer Interfaces (BCI). The Mindset headset is a brainwave sensing device that is now commercially available. Talk about transparency! Just think and you can control on-screen objects.
Here are a couple of YouTube reports - one showing the Mindset in operation:
And, Stanford University held a seminar to examine the Emotiv Epoc headset: