[tgokh]

This is hugely important. EKG changes are common - drugs change the QT interval, heart disease and subacute ischemia can cause T wave changes, people can go in and out of atrial fibrillation or throw PVCs, etc. I'd be very impressed if you can reliably identify a user over a period of years using EKG traces.

Your use of EKG to determine "in-game focus", "driver fatigue" and workout quality is definitely interesting. Is there literature showing reliability of these measures from EKG readings and heart rate, or are you using other sensors in addition to EKG? You mentioned in another reply that your group has published papers on EKG biometrics - you should definitely link to or at least cite those on your website.

[capcarr]

We'll post some links, thanks for the suggestion.