Dr Debra Lieberman

American evolutionary psychologist at the University of Miami whose research on disgust psychology and kinship detection — and her co-authored Objection (with Carlton Patrick) — addresses how disgust shapes moral judgment and the evolutionary origins of ethical intuitions.

Develops the most rigorous evolutionary account of disgust as a moral system — showing that the disgust psychology evolved for pathogen and toxin avoidance gets co-opted for moral judgment — explaining why moral intuitions are often not reasons but gut reactions, and why rational argument often fails to change them.