I recently got a wearable EEG device called the Crown from a company called Neurosity. The device measures brain waves which are electrical impulses in the brain. So since the brain is highly plastic (which means it can adapt) and the neurons are highly interconnected and generate these electrochemical impulses called brainwaves, I thought it would be interesting to measure my own brain waves primarily while meditating and learning.
So you can essentially train your brain to maintain a particular state for longer or more frequently than another state.
I choose the Crown over other wearable devices like the Muse because I also want to be able to log the results and then kind of build a neuro-app (AKA web application but neuro app sounds more exciting)