An app that can track a smartphone user’s happiness with the help of phone data and the user’s perception of mood has been developed by researchers at Cambridge University.

The app is part of a project to see how mobile phones can be used to improve health and well-being.
Mood-tracking apps already exist but the team from the Cambridge Computer Laboratory think this is the first time that user-input data and phone information sources have been combined.
Dr Jason Rentfrow, a senior lecturer in the department of psychology at Cambridge University said the aim here is to use a more flexible approach, to collect data that shows how moods vary between people.
When the app is opened for the first time, a sensor that tells the researchers what time of day it is is unlocked. The app spends roughly a week collecting data from this sensor and testing it against the user's emotional state. At the end of this, the user is asked to complete a short life satisfaction survey, which unlocks a new sensor, after about eight weeks.
Lead researcher Dr Neal Lathia said the app has been designed as "a journey of discovery" for the user to give them a step-by-step guide to what might be influencing their mood swings.
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The app is expected to be used by doctors as a therapeutic tool as well as by individuals to work out the times that they are most stressed, for example.
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Source-ANI