Quantified Self

The Quantified Self, also known as lifelogging, is a movement to incorporate technology into data acquisition on aspects of a person's daily life in terms of inputs (food consumed, quality of surrounding air), states (mood, arousal, blood oxygen levels), and performance, whether mental or physical. In short, quantified self is self-knowledge through self-tracking with technology.

Data collection through self-monitoring and self-sensing combines wearable sensors (e.g. EEG, ECG) and wearable computing. Among the specific biometrics one can track are insulin and cortisol levels, sequence DNA, and the microbial cells which inhabit one's body.

Other names for using self-tracking data to improve daily functioning are self-tracking, auto-analytics, body hacking, self-quantifying, self-surveillance, and personal informatics.

According to Riphagen et al., the history of the quantimetric self-tracking using wearable computers began in the 1970s:

"The history of self-tracking using wearable sensors in combination with wearable computing and wireless communication already exists for many years, and also appeared, in the form of sousveillance back in the 1970s [13, 12]"

Quantimetric self-sensing was proposed for the use of wearable computers to automatically sense and measure exercise and dietary intake in 2002:

"Sensors that measure biological signals, ... a personal data recorder that records ... Lifelong videocapture together with blood-sugar levels, ... correlate blood-sugar levels with activities such as eating, by capturing a food record of intake."

(See also,.)

The “quantified self” or “self-tracking” are contemporary labels. They reflect the broader trend of the progressions for organization and meaning-making in human history; there has been a use of self-taken measurements and data collection that attempted the same goals that the quantified movement has. Scientisation plays a major role in legitimizing self-knowledge through self-tracking.

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