 Participants in that revolution, such as Jerry Fodor, reject epiphenomenalism and insist upon the efficacy of the mind.Fodor even speaks of "epiphobia"—fear that one is becoming an epiphenomenalist.Thomas Henry Huxley defends in an essay titled "On the Hypothesis that Animals are Automata, and its History" an epiphenomenalist theory of consciousness according to which consciousness is a causally inert effect of neural activity—"as the steam-whistle which accompanies the work of a locomotive engine is without influence upon its machinery".