The trigger is usually some sort of threat to their gender identity, values, loyalties, and goals. Whether they are depressed or agitated, it's usually a panic attack for fear of being left alone. They will experience chronic feelings of emptiness and boredom . There will also be temper tantrums displayed at times which seem just for the sake of getting angry, in other words, inappropriate displays of intense anger . When asked why they are angry about something that a moment ago made them happy, they'll say they were trying to put things right, or something like that.
Disassociation is the mental separation of person from place.
People with personality disorders often don't know what person they are or what place they're at. Dissassociation is more than daydreaming or spacing out, however. It's not the same as a split personality, but instead the experience that there's someone inside watching you, through your eyes, as you do things. Robert Ressler, former FBI profiler, has stated that doubling is quite common among serial killers as among anybody who can separate the personality who commits the crimes from the more in-control self. If so, elaborate.