Genetic and environmental influences on antisocial behaviour with and without callous-unemotional traits

TEDS twin study (n=3,687 pairs). Antisocial behaviour without CU traits showed substantial shared-environment influence; antisocial behaviour WITH CU traits was strongly heritable (h²>0.80) with minimal shared environment. Established CU+conduct subtype as etiologically distinct - has implications for prevention focus (CU- responds more to family/environmental intervention; CU+ requires targeted approaches).