Is there a good measure of mental energy, focus and alertness? 1-3 variables that are as easy to measure as heart rate?
.@skinnerlayne what's the theory behind pupil diameter as a measure of alertness/energy/focus?
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
.@skinnerlayne what's the theory behind pupil diameter as a measure of alertness/energy/focus?