Life Logger

Experience Sampling or Ecological Momentary Assessment (EMA), as defined in Springer by Dr. C. Renn Upchurch Sweeney, refers to a collection of methods often used in behavioral medicine research by which a research participant repeatedly reports on symptoms, affect, behavior, and cognitions close in time to experience and in the participants’ natural environment. Technologies such as written diaries, electronic diaries, telephones, and physiological sensors are often utilized in EMA studies. EMA studies can be utilized to study a variety of topics such as depression, social support, relationships, diet, work activity and satisfaction, psychotherapy, drug use, allergies, psychological stress, medications, self-esteem, and asthma.

The Life Logger is an Android based application that receives data from an established sensor network (detailed here) and presents it in an intuitive format to enable users to review and log daily activities with minimal effort. It also enables researchers to view key elements of the participant’s life in a single glance.


A component of the Life Logger is the Interrogator. This application periodically prompts the user to enter their daily activities with minimal interactions. The activities labelled by the Interrogator are used by the Life Logger to help user’s recollect their day.

The most basic version of the Life Loggers contains data scraped from a smartphone, Fitbit, wearable camera and the Interrogator. The application is continuously being updated to enhance user experience and add more data streams.



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