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. 2008 Apr 23;363(1503):2519–2527. doi: 10.1098/rstb.2008.0037

Figure 2.

Figure 2

The heritability of AB appears strong in those children with elevated levels of both AB and callous–unemotional traits (AB/CU+). By contrast, children with AB but lower levels of CU traits (AB/CU−) show a strong environmental influence on their AB (Viding et al. 2005, 2008). This finding holds even when the contribution of co-occurring hyperactivity is controlled for in the analyses (Viding et al. 2008). A, additive genetic influences; C, shared environmental influences; E, non-shared environmental influences.