It always begins with a concept.
From the company Neurowear comes the Necomimi, "cat" ears that are controlled with the user's mind. The sensors supposedly read the brain-waves of the user wearing the ears. The assumption would be that the user could get better at controlling them over time. It seems when people are paying attention to something, listening, or smelling something pleasant, the ears go up. When the user relaxes, the ears fold down. Like the Mattel Mindflex toy, the Necomimi used Electroencephalography (EEG). By sensing the electrical activity along the scalp. In other words, voltage fluctuations from ionic current flows within the brain's neurons. EEG is normally used as first step in detecting tumors, possible stoke, and other brain disorders. Here, the EEG human machine interface is moving cat ears.
Normal EEG sensors are affixed securly in certain locations on the scalp/head to get accurcate readings. Necomimi appeard to have the bar sensor touching randemly on each persons forehead. And I am sure that full contact was not made in every case. It is a toy after all. Nevertheless, Necomimi is lots of fun for everyone.