Principles of ecological momentary assessment, showing the details of a single day in the EMA paradigm.

<p>At 10 random moments during the day, mental states (eg anxiety, low mood, paranoia, being happy) and contexts (stress, company, activity, drug use) are assessed. The arrows represent examples of prospectively analysing the impact of mental states and contexts on each other over time, allowing for the construction of mROM measures such as stress-sensitivity (impact of stress on negative affect) or reward experience (impact of positive events on positive affect).