When you think about it, your smart phone knows you in a way that no one else can, even your nearest and dearest. Even your psychologist.
Your phone can track where you are, how you are moving, what you are seeing, what you are hearing and, if linked to an activity tracker, how you are sleeping. It can even monitor your emails, texts and phone calls to assess how social you are. It may sound like Big Brother, but when governed by privacy protocols this wearable sensing, combined with big data computing, is the closest we’ve yet come to cataloguing our lived experience. It promises to uncover new information on how we think, learn, use language and recall memories, and better understand and treat mental illnesses. And it is already happening.