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Both Akili and Thymia say that their apps should be used in addition to existing doctor-led monitoring and treatments, and not as a replacement.

In London, UK app Thymia is using computer games to help doctors and other medical professionals detect and diagnose mental health issues, particularly depression.

Thymia execs, however, say that the game works well because it creates a natural setting for a subject to spin off data; a person immersed in a video game is less likely even to think they are taking a test.

The Thymia games, available free for clinicians from its site, are minimalist.

In doing things this way, Thymia execs say alarms are sounded that would have remained silent in a traditional office-visit structure.