it can add culture at this event may feel them selves withdrawld(sorry about spelling) and private. they might stop doing their regular activites, atleast this happens to me. i am bipolar so this is a different strain but i believe its dear righteous not so rapid. i wouldnt blame all depressed people for this and solitary them, merely i would vote its reasons all for more vocal fights.
from what I hold seen during each of my deployments [I have done 17 deployments in my careers], is by ingestion, or cheating, or dropping him.