We've covered the MIT project called MindRider before, but at the time, it was more of a device to help alert you in real time to areas in your route that were causing stress.
The inventors have improved the helmet to be a "mindmapping" tool for finding your best bike route. The helmet features a soft forehead-based sensor that uses EEG (electroencephalography) to measure electrical activity in the rider's brain, along with an ear-based sensor that's used to remove noise from the EEG signal. It also has an LED located on its brim, that's visible to the wearer as they ride. The LEDs glow green for a calm state of mind or red for a more stressed state of mind during a bike rider's route.
Now, the team has made it Bluetooth compatible so that the information from the EEG sensor is fed to an app on the user's smartphone which uses the phone's GPS to map the relaxing "sweetspots" in green and the stressful "hotspots" in red so that riders can see where the ups and downs of their ride are taking place.