Yeah, the dry EEG sensors detect brainwave states. The science behind the toy suggests that brainwaves are in given states during concentration and relaxation. The ‘jedi levels’ Yoda takes you through require a mixture of focus and relaxation that map to the location of the ball in the column. The fan in the column will speed up and slow down according to the brainwaves being relayed by the wireless headset. Pretty nifty – definitely works well and responds predictably according to relaxation techniques. My son found that deep breathing and closed eyes results in the ball hovering in level 1 of the chamber, doing mental math will allow him to hover the ball in the second level of the chamber, and imagining himself running fast through a field eventually resulted in the ball rising and remaining in the 3rd level of the chamber … pretty fun stuff. You rise through your Jedi training according to how precisely and quickly you can respond to Yoda’s instructions for changing the location of the ball in the chamber.