Since serotonin is one of those feel-good neurotransmitters, having more of it likely improves some of the other symptoms like withdrawal and flat affect.
I mean, we work with some people who have schizophrenia and they're really blunted and they're having cognitive dysfunction and sometimes neuromuscular disorders.
This lack of interest in money meant that all the brothers would probably be poor for ever, but Angel still admired his father's belief that money was not important.
All passiveness and unconcern had dropped from them. They were alert and active, anxious that the work should go well, and fiercely irritable with whatever, by delay or confusion, retarded that work.