“Only the shallow know themselves.” — Oscar Wilde
Human instrumentation is booming. FitBit can track the number of steps you take a day, how many miles you’ve walked, calories burned, your minutes asleep, and the number of times you woke up during the night. BodyMedia’s armbands are similar, as is the Philips DirectLife device. You can track your running habits with RunKeeper, your weight with a WiFi Withings scale that will Tweet to your friends, your moods on MoodJam or what makes you happy on TrackYourHappiness. Get even more obsessive about your sleep with Zeo, or about your baby’s sleep (or other biological) habits with TrixieTracker. Track your web browsing, your electric use (or here), your spending, your driving, how much you discard or recycle, your movements and location, your pulse, your illness symptoms, what music you listen to, your meditations, your Tweeting patterns. And, of course, publish it all — plus anything else you care to track manually (or on your smartphone) — on Daytum or mycrocosm or me-trics or elsewhere.
There are names for this craze or movement. Gary Wolf & Kevin Kelly call this the “quantified self” (see Wolf’s must-watch recent Ted talk and Wired articles on the subject) and have begun an international organization to connect self-quantifiers. The trend is related to physiological computing, personal informatics, and life logging.
There are all sorts of legal implications to these developments. We have already incorporated sensors into the penal system (e.g., ankle bracelets & alcohol monitors in cars). How will sensors and self-tracking integrate into other legal domains and doctrines? Proving an alibi becomes easier if you’re real-time streaming your GPS-tracked location to your friends. Will we someday subpoena emotion or mood data, pulse, or other sensor-provided information to challenge claims and defenses about emotional state, intentions, mens rea? Will we evolve contexts in which there is an obligation to track personal information — to prove one’s parenting abilities, for example?




