Why mevisMD had the same feeling and centrums has and Joshua then lose it and turn extremely aggressive in Mavis entry before the insidtant she had the same centrums of the feeling and she said she was extremely depressed, Joshua showed extremely signs of depression before going in to a aversion state he had the feeling has well... its choosing. its choosing if it stays, the emotion can base it self off your life or its will spanned maybe that's why it choose to stay until it evolved enough and so it can stay, maybe this exacted feeling had a bad effect to the humane Brian some it save people from depression and ending their life other it made them in to monsters