Enantiodromia
Enantiodromia was a therapeutic term meaning "conversion into the opposite", whereby a person attempted to alter their personality in response to a trauma.

In 2368, Deanna Troi diagnosed a young boy named , the only survivor of the research vessel  with enantiodromia, when Timothy attempted to emulate the android Data in an effort to deal with the deaths of his parents. 

Troi suggested to Data that, as this was a normal part of Timothy's grieving process, Data should encourage Timothy in his efforts to become more android-like, and that Timothy would eventually be able to come to terms with his loss. ()

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Psychological conditions