MindOMeter

MindOMeter visualizes your brainwaves much like classic electroencephalography (EEG) machines. It connects wirelessly to the MindWave Mobile EEG headset by NeuroSky. Try the demo mode before you buy the headset here: http://store.neurosky.com/products/mindwave-mobile

MindOMeter displays your brainwaves as waveforms. You can view standard frequency bands (alpha, theta, etc.) as well as NeuroSky's proprietary eSense attention and meditation meters. Use your finger to scroll; pinch to change zoom.

MindOMeter can also run in the background, so you can use other apps while measuring your mind. How did that game affect your attention? What are those binaural beats doing to your gamma waves? Sleep your device and record your brainwaves while you move, work, or meditate.