I found this in another forum:

A project from MIT:

"MindRider is a helmet that translates electroencephalogram (EEG) feedback into an embedded LED display. For the wearer, green lights indicate a focused, active mental state, while red lights indicate drowsiness, anxiety, and other states not conducive to operating a bike or vehicle. Flashing red lights indicate extreme anxiety (panic). As many people return to cycling as a primary means of transportation, MindRider can support safety by adding visibility and increased awareness to the cyclist/motorist interaction process."

http://web.media.mit.edu/~arlduc/projects/mindrider/

As good of an idea as it is, I think that it is targeting the wrong demographic.