P K Dick's Do Androids Dream of Electric Sheep

But then I realized how unhealthy it was, sensing the absence of life, not just in this building but everywhere, and not reacting—do you see? I guess you don’t. But that used to be considered a sign of mental illness; they called it ‘absence of appropriate affect.’ So I left the TV sound off and I sat down at my mood organ and I experimented. And I finally found a setting for despair.” Her dark, pert face showed satisfaction, as if she had achieved something of worth. “So I put it on my schedule for twice a month; I think that’s a reasonable amount of time to feel hopeless about everything, about staying here on Earth after everybody who’s smart has emigrated, don’t you think?”